25 changed files with 1479 additions and 18 deletions
@ -1,24 +1,25 @@ |
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Package: daybreak |
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Type: Package |
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Title: daybreak title goes here otherwise CRAN checks fail |
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Title: Compute Sun Rise/Set Times, Start/End of Twilight, and the |
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Length of the Day at Any Date and Latitude |
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Version: 0.1.0 |
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Date: 2019-12-31 |
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Authors@R: c( |
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person("Bob", "Rudis", email = "bob@rud.is", role = c("aut", "cre"), |
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comment = c(ORCID = "0000-0001-5670-2640")) |
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comment = c(ORCID = "0000-0001-5670-2640")), |
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person("Paul", "Schlyter", role = "aut", comment = "sunriset lib") |
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) |
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Maintainer: Bob Rudis <bob@rud.is> |
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Description: A good description goes here otherwise CRAN checks fail. |
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Description: A wrapper for Paul Schlyter's C-based library for computing |
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sunrise, sunset, twilight start and end, plus the length of day for |
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a given data and coordinates. |
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URL: https://gitlab.com/hrbrmstr/daybreak |
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BugReports: https://gitlab.com/hrbrmstr/daybreak/issues |
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Encoding: UTF-8 |
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License: AGPL |
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Suggests: |
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covr |
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NeedsCompilation: yes |
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License: MIT + file LICENSE |
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Depends: |
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R (>= 3.2.0) |
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Imports: |
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httr, |
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jsonlite |
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Roxygen: list(markdown = TRUE) |
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RoxygenNote: 7.0.2 |
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Suggests: tinytest |
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|
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@ -0,0 +1,2 @@ |
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YEAR: 2019 |
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COPYRIGHT HOLDER: Bob Rudis |
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@ -0,0 +1,21 @@ |
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# MIT License |
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|
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Copyright (c) 2019 Bob Rudis |
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|
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Permission is hereby granted, free of charge, to any person obtaining a copy |
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of this software and associated documentation files (the "Software"), to deal |
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in the Software without restriction, including without limitation the rights |
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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copies of the Software, and to permit persons to whom the Software is |
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furnished to do so, subject to the following conditions: |
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|
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The above copyright notice and this permission notice shall be included in all |
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copies or substantial portions of the Software. |
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|
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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SOFTWARE. |
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@ -1,4 +1,11 @@ |
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# Generated by roxygen2: do not edit by hand |
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|
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import(httr) |
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importFrom(jsonlite,fromJSON) |
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export(astronomical_twilight) |
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export(civil_twilight) |
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export(day_astronomical_twilight_length) |
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export(day_civil_twilight_length) |
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export(day_length) |
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export(day_nautical_twilight_length) |
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export(nautical_twilight) |
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export(sun_rise_set) |
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useDynLib(daybreak, .registration = TRUE) |
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|
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@ -1,9 +1,13 @@ |
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#' ... |
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#' Compute Sun Rise/Set Times, Start/End of Twilight, and the |
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#' Length of the Day at Any Date and Latitude |
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#' |
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#' A wrapper for Paul Schlyter's C-based library for computing |
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#' sunrise, sunset, twilight start and end, plus the length of day for |
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#' a given data and coordinates. |
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#' |
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#' @md |
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#' @name daybreak |
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#' @keywords internal |
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#' @author Bob Rudis (bob@@rud.is) |
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#' @import httr |
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#' @importFrom jsonlite fromJSON |
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#' @useDynLib daybreak, .registration = TRUE |
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"_PACKAGE" |
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|
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@ -0,0 +1,132 @@ |
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#' Length of day |
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#' |
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#' @param date The date to compute the length for. An R [DateTimeClasses] object |
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#' or something that can be coerced into one by [as.POSIXlt()]. |
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#' @param lon,lat longitude & latitude |
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#' @return (dbl) length of day |
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#' @export |
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#' @examples |
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#' day_length("2019-12-31", -70.8636, 43.2683) |
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day_length <- function(date = Sys.Date(), lon, lat) { |
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|
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date <- valid_date(date) |
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lon <- valid_lon(lon) |
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lat <- valid_lat(lat) |
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|
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.Call("r_day_length", date$year+1900L, date$mon+1L, date$mday, lon, lat) |
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|
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} |
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|
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|
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#' Length of civil twilight |
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#' |
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#' @param date The date to compute the length for. An R [DateTimeClasses] object |
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#' or something that can be coerced into one by [as.POSIXlt()]. |
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#' @param lon,lat longitude & latitude |
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#' @return (dbl) day civil twilight length |
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#' @export |
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#' @examples |
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#' day_length("2019-12-31", -70.8636, 43.2683) |
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day_civil_twilight_length <- function(date, lon, lat) { |
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date <- valid_date(date) |
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lon <- valid_lon(lon) |
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lat <- valid_lat(lat) |
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.Call("r_day_civil_twilight_length", date$year+1900L, date$mon+1L, date$mday, lon, lat) |
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} |
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|
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#' Length of nautical twilight |
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#' |
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#' @param date The date to compute the length for. An R [DateTimeClasses] object |
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#' or something that can be coerced into one by [as.POSIXlt()]. |
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#' @param lon,lat longitude & latitude |
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#' @return (dbl) day nautical twilight length |
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#' @export |
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#' @examples |
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#' day_nautical_twilight_length("2019-12-31", -70.8636, 43.2683) |
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day_nautical_twilight_length <- function(date, lon, lat) { |
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date <- valid_date(date) |
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lon <- valid_lon(lon) |
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lat <- valid_lat(lat) |
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.Call("r_day_nautical_twilight_length", date$year+1900L, date$mon+1L, date$mday, lon, lat) |
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} |
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|
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#' Length of astronomical twilight |
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#' |
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#' @param date The date to compute the length for. An R [DateTimeClasses] object |
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#' or something that can be coerced into one by [as.POSIXlt()]. |
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#' @param lon,lat longitude & latitude |
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#' @return (dbl) astronomical twilight length |
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#' @export |
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#' @examples |
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#' day_astronomical_twilight_length("2019-12-31", -70.8636, 43.2683) |
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day_astronomical_twilight_length <- function(date, lon, lat) { |
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date <- valid_date(date) |
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lon <- valid_lon(lon) |
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lat <- valid_lat(lat) |
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.Call("r_day_astronomical_twilight_length", date$year+1900L, date$mon+1L, date$mday, lon, lat) |
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} |
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|
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#' Sun rise/set times |
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#' |
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#' @param date The date to compute the length for. An R [DateTimeClasses] object |
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#' or something that can be coerced into one by [as.POSIXlt()]. |
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#' @param lon,lat longitude & latitude |
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#' @return (dbl) sunrise/sunset |
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#' @export |
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#' @examples |
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#' sun_rise_set("2019-12-31", -70.8636, 43.2683) |
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sun_rise_set <- function(date, lon, lat) { |
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date <- valid_date(date) |
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lon <- valid_lon(lon) |
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lat <- valid_lat(lat) |
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.Call("r_sun_rise_set", date$year+1900L, date$mon+1L, date$mday, lon, lat) |
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} |
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|
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#' Civil twilight |
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#' |
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#' @param date The date to compute the length for. An R [DateTimeClasses] object |
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#' or something that can be coerced into one by [as.POSIXlt()]. |
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#' @param lon,lat longitude & latitude |
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#' @return (dbl) civil twilight |
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#' @export |
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#' @examples |
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#' civil_twilight("2019-12-31", -70.8636, 43.2683) |
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civil_twilight <- function(date, lon, lat) { |
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date <- valid_date(date) |
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lon <- valid_lon(lon) |
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lat <- valid_lat(lat) |
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.Call("r_civil_twilight", date$year+1900L, date$mon+1L, date$mday, lon, lat) |
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} |
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|
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#' Nautical twilight |
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#' |
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#' @param date The date to compute the length for. An R [DateTimeClasses] object |
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#' or something that can be coerced into one by [as.POSIXlt()]. |
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#' @param lon,lat longitude & latitude |
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#' @return (dbl) nautical twilight |
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#' @export |
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#' @examples |
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#' nautical_twilight("2019-12-31", -70.8636, 43.2683) |
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nautical_twilight <- function(date, lon, lat) { |
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date <- valid_date(date) |
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lon <- valid_lon(lon) |
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lat <- valid_lat(lat) |
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.Call("r_nautical_twilight", date$year+1900L, date$mon+1L, date$mday, lon, lat) |
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} |
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|
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#' Astronomical twilight |
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#' |
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#' @param date The date to compute the length for. An R [DateTimeClasses] object |
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#' or something that can be coerced into one by [as.POSIXlt()]. |
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#' @param lon,lat longitude & latitude |
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#' @return (dbl) astronomical twilight |
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#' @export |
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#' @examples |
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#' astronomical_twilight("2019-12-31", -70.8636, 43.2683) |
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astronomical_twilight <- function(date, lon, lat) { |
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date <- valid_date(date) |
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lon <- valid_lon(lon) |
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lat <- valid_lat(lat) |
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.Call("r_astronomical_twilight", date$year+1900L, date$mon+1L, date$mday, lon, lat) |
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} |
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|
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@ -0,0 +1,15 @@ |
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valid_date <- function(date) { |
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as.POSIXlt(date[1]) |
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} |
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|
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valid_lon <- function(lon) { |
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lon <- lon[1] |
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stopifnot(lon >= -180 & lon <= 180) |
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lon |
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} |
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|
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valid_lat <- function(lat) { |
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lat <- lat[1] |
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stopifnot(lat >= -90 & lat <= 90) |
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lat |
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} |
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@ -0,0 +1,188 @@ |
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|
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[](https://www.repostatus.org/#active) |
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[](https://keybase.io/hrbrmstr) |
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 |
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[](https://travis-ci.org/hrbrmstr/daybreak) |
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 |
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 |
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|
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# daybreak |
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|
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Compute Sun Rise/Set Times, Start/End of Twilight, and the Length of the |
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Day at Any Date and Latitude |
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|
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## Description |
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|
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A wrapper for Paul Schlyter’s C-based library for computing sunrise, |
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sunset, twilight start and end, plus the length of day for a given data |
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and coordinates. |
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|
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## What’s Inside The Tin |
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|
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The following functions are implemented: |
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|
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- `astronomical_twilight`: Astronomical twilight |
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- `civil_twilight`: Civil twilight |
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- `day_astronomical_twilight_length`: Length of astronomical twilight |
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- `day_civil_twilight_length`: Length of civil twilight |
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- `day_length`: Length of day |
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- `day_nautical_twilight_length`: Length of nautical twilight |
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- `nautical_twilight`: Nautical twilight |
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- `sun_rise_set`: Sun rise/set times |
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|
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## Installation |
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|
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``` r |
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remotes::install_git("https://git.rud.is/hrbrmstr/daybreak.git") |
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# or |
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remotes::install_git("https://git.sr.ht/~hrbrmstr/daybreak") |
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# or |
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remotes::install_gitlab("hrbrmstr/daybreak") |
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# or |
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remotes::install_bitbucket("hrbrmstr/daybreak") |
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``` |
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|
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NOTE: To use the ‘remotes’ install options you will need to have the |
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[{remotes} package](https://github.com/r-lib/remotes) installed. |
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|
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## Usage |
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|
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``` r |
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library(daybreak) |
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|
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# current version |
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packageVersion("daybreak") |
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## [1] '0.1.0' |
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``` |
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|
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Near me: |
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|
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``` r |
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day_length("2019-12-31", -70.8636, 43.2683) |
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## [1] 9.031444 |
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day_civil_twilight_length("2019-12-31", -70.8636, 43.2683) |
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## [1] 10.10834 |
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day_nautical_twilight_length("2019-12-31", -70.8636, 43.2683) |
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## [1] 11.30569 |
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day_astronomical_twilight_length("2019-12-31", -70.8636, 43.2683) |
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## [1] 12.45998 |
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sun_rise_set("2019-12-31", -70.8636, 43.2683) |
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## $rise |
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## [1] 12.25761 |
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## |
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## $set |
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## [1] 21.28906 |
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civil_twilight("2019-12-31", -70.8636, 43.2683) |
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## $start |
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## [1] 11.71917 |
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## |
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## $end |
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## [1] 21.82751 |
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nautical_twilight("2019-12-31", -70.8636, 43.2683) |
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## $start |
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## [1] 11.12049 |
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## |
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## $end |
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## [1] 22.42618 |
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astronomical_twilight("2019-12-31", -70.8636, 43.2683) |
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## $start |
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## [1] 10.54335 |
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## |
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## $end |
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## [1] 23.00332 |
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``` |
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|
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Tromsø, Norway (Winter) |
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|
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``` r |
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day_length("2019-12-31", 18.9553, 69.6492) |
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## [1] 0 |
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day_civil_twilight_length("2019-12-31", 18.9553, 69.6492) |
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## [1] 4.613116 |
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day_nautical_twilight_length("2019-12-31", 18.9553, 69.6492) |
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## [1] 8.000323 |
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day_astronomical_twilight_length("2019-12-31", 18.9553, 69.6492) |
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## [1] 10.5871 |
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sun_rise_set("2019-12-31", 18.9553, 69.6492) |
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## $rise |
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## [1] NA |
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## |
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## $set |
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## [1] NA |
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civil_twilight("2019-12-31", 18.9553, 69.6492) |
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## $start |
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## [1] 8.476866 |
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## |
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## $end |
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## [1] 13.08998 |
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nautical_twilight("2019-12-31", 18.9553, 69.6492) |
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## $start |
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## [1] 6.783262 |
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## |
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## $end |
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## [1] 14.78359 |
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astronomical_twilight("2019-12-31", 18.9553, 69.6492) |
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## $start |
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## [1] 5.489872 |
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## |
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## $end |
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## [1] 16.07698 |
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``` |
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|
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Tromsø, Norway (Summer) |
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|
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``` r |
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day_length("2019-06-01", 18.9553, 69.6492) |
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## [1] 24 |
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day_civil_twilight_length("2019-06-01", 18.9553, 69.6492) |
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## [1] 24 |
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day_nautical_twilight_length("2019-06-01", 18.9553, 69.6492) |
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## [1] 24 |
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day_astronomical_twilight_length("2019-06-01", 18.9553, 69.6492) |
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## [1] 24 |
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sun_rise_set("2019-06-01", 18.9553, 69.6492) |
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## $rise |
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## [1] NA |
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## |
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## $set |
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## [1] NA |
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civil_twilight("2019-06-01", 18.9553, 69.6492) |
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## $start |
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## [1] NA |
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## |
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## $end |
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## [1] NA |
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nautical_twilight("2019-06-01", 18.9553, 69.6492) |
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## $start |
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## [1] NA |
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## |
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## $end |
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## [1] NA |
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astronomical_twilight("2019-06-01", 18.9553, 69.6492) |
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## $start |
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## [1] NA |
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## |
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## $end |
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## [1] NA |
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``` |
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|
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## daybreak Metrics |
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|
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| Lang | \# Files | (%) | LoC | (%) | Blank lines | (%) | \# Lines | (%) | |
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| :----------- | -------: | ---: | --: | ---: | ----------: | ---: | -------: | ---: | |
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| C | 3 | 0.33 | 267 | 0.66 | 110 | 0.60 | 245 | 0.60 | |
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| R | 4 | 0.44 | 65 | 0.16 | 16 | 0.09 | 84 | 0.20 | |
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| C/C++ Header | 1 | 0.11 | 39 | 0.10 | 35 | 0.19 | 44 | 0.11 | |
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| Rmd | 1 | 0.11 | 32 | 0.08 | 21 | 0.12 | 37 | 0.09 | |
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|
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## Code of Conduct |
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|
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Please note that this project is released with a Contributor Code of |
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Conduct. By participating in this project you agree to abide by its |
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terms. |
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expect_equivalent( |
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day_length("2019-12-31", -70.8636, 43.2683), |
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9.03144433072786 |
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) |
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|
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expect_equivalent( |
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day_civil_twilight_length("2019-12-31", -70.8636, 43.2683), |
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10.1083411766176 |
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) |
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|
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expect_equivalent( |
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day_nautical_twilight_length("2019-12-31", -70.8636, 43.2683), |
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11.3056891617088 |
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) |
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|
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expect_equivalent( |
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day_astronomical_twilight_length("2019-12-31", -70.8636, 43.2683), |
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12.459975565969 |
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) |
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|
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expect_equivalent( |
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sun_rise_set("2019-12-31", -70.8636, 43.2683), |
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list(rise = 12.2576146717076, set = 21.2890590024355) |
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) |
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|
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expect_equivalent( |
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civil_twilight("2019-12-31", -70.8636, 43.2683), |
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list(start = 11.7191662487627, end = 21.8275074253803) |
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) |
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|
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expect_equivalent( |
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nautical_twilight("2019-12-31", -70.8636, 43.2683), |
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list(start = 11.1204922562171, end = 22.4261814179259) |
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) |
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|
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expect_equivalent( |
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astronomical_twilight("2019-12-31", -70.8636, 43.2683), |
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list(start = 10.543349054087, end = 23.003324620056) |
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) |
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|
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expect_equivalent( |
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day_length("2019-12-31", 18.9553, 69.6492), |
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0 |
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) |
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|
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expect_equivalent( |
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day_civil_twilight_length("2019-12-31", 18.9553, 69.6492), |
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4.61311561714866 |
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) |
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|
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expect_equivalent( |
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day_nautical_twilight_length("2019-12-31", 18.9553, 69.6492), |
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8.00032348106164 |
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) |
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|
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expect_equivalent( |
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day_astronomical_twilight_length("2019-12-31", 18.9553, 69.6492), |
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10.5871031550164 |
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) |
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|
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expect_equivalent( |
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sun_rise_set("2019-12-31", 18.9553, 69.6492), |
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list(rise = NA_real_, set = NA_real_) |
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) |
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|
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expect_equivalent( |
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civil_twilight("2019-12-31", 18.9553, 69.6492), |
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list(start = 8.47686578254252, end = 13.0899813996912) |
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) |
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|
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expect_equivalent( |
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nautical_twilight("2019-12-31", 18.9553, 69.6492), |
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list(start = 6.78326185058603, end = 14.7835853316477) |
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) |
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|
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expect_equivalent( |
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astronomical_twilight("2019-12-31", 18.9553, 69.6492), |
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list(start = 5.48987201360863, end = 16.0769751686251) |
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) |
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|
|||
expect_equivalent( |
|||
day_length("2019-06-01", 18.9553, 69.6492), |
|||
24 |
|||
) |
|||
|
|||
expect_equivalent( |
|||
day_civil_twilight_length("2019-06-01", 18.9553, 69.6492), |
|||
24 |
|||
) |
|||
|
|||
expect_equivalent( |
|||
day_nautical_twilight_length("2019-06-01", 18.9553, 69.6492), |
|||
24 |
|||
) |
|||
|
|||
expect_equivalent( |
|||
day_astronomical_twilight_length("2019-06-01", 18.9553, 69.6492), |
|||
24 |
|||
) |
|||
|
|||
expect_equivalent( |
|||
sun_rise_set("2019-06-01", 18.9553, 69.6492), |
|||
list(rise = NA_real_, set = NA_real_) |
|||
) |
|||
|
|||
expect_equivalent( |
|||
civil_twilight("2019-06-01", 18.9553, 69.6492), |
|||
list(start = NA_real_, end = NA_real_) |
|||
) |
|||
|
|||
expect_equivalent( |
|||
nautical_twilight("2019-06-01", 18.9553, 69.6492), |
|||
list(start = NA_real_, end = NA_real_) |
|||
) |
|||
|
|||
expect_equivalent( |
|||
astronomical_twilight("2019-06-01", 18.9553, 69.6492), |
|||
list(start = NA_real_, end = NA_real_) |
|||
) |
|||
@ -0,0 +1,23 @@ |
|||
% Generated by roxygen2: do not edit by hand |
|||
% Please edit documentation in R/daybreak-wrappers.R |
|||
\name{astronomical_twilight} |
|||
\alias{astronomical_twilight} |
|||
\title{Astronomical twilight} |
|||
\usage{ |
|||
astronomical_twilight(date, lon, lat) |
|||
} |
|||
\arguments{ |
|||
\item{date}{The date to compute the length for. An R \link{DateTimeClasses} object |
|||
or something that can be coerced into one by \code{\link[=as.POSIXlt]{as.POSIXlt()}}.} |
|||
|
|||
\item{lon, lat}{longitude & latitude} |
|||
} |
|||
\value{ |
|||
(dbl) astronomical twilight |
|||
} |
|||
\description{ |
|||
Astronomical twilight |
|||
} |
|||
\examples{ |
|||
astronomical_twilight("2019-12-31", -70.8636, 43.2683) |
|||
} |
|||
@ -0,0 +1,23 @@ |
|||
% Generated by roxygen2: do not edit by hand |
|||
% Please edit documentation in R/daybreak-wrappers.R |
|||
\name{civil_twilight} |
|||
\alias{civil_twilight} |
|||
\title{Civil twilight} |
|||
\usage{ |
|||
civil_twilight(date, lon, lat) |
|||
} |
|||
\arguments{ |
|||
\item{date}{The date to compute the length for. An R \link{DateTimeClasses} object |
|||
or something that can be coerced into one by \code{\link[=as.POSIXlt]{as.POSIXlt()}}.} |
|||
|
|||
\item{lon, lat}{longitude & latitude} |
|||
} |
|||
\value{ |
|||
(dbl) civil twilight |
|||
} |
|||
\description{ |
|||
Civil twilight |
|||
} |
|||
\examples{ |
|||
civil_twilight("2019-12-31", -70.8636, 43.2683) |
|||
} |
|||
@ -0,0 +1,23 @@ |
|||
% Generated by roxygen2: do not edit by hand |
|||
% Please edit documentation in R/daybreak-wrappers.R |
|||
\name{day_astronomical_twilight_length} |
|||
\alias{day_astronomical_twilight_length} |
|||
\title{Length of astronomical twilight} |
|||
\usage{ |
|||
day_astronomical_twilight_length(date, lon, lat) |
|||
} |
|||
\arguments{ |
|||
\item{date}{The date to compute the length for. An R \link{DateTimeClasses} object |
|||
or something that can be coerced into one by \code{\link[=as.POSIXlt]{as.POSIXlt()}}.} |
|||
|
|||
\item{lon, lat}{longitude & latitude} |
|||
} |
|||
\value{ |
|||
(dbl) astronomical twilight length |
|||
} |
|||
\description{ |
|||
Length of astronomical twilight |
|||
} |
|||
\examples{ |
|||
day_astronomical_twilight_length("2019-12-31", -70.8636, 43.2683) |
|||
} |
|||
@ -0,0 +1,23 @@ |
|||
% Generated by roxygen2: do not edit by hand |
|||
% Please edit documentation in R/daybreak-wrappers.R |
|||
\name{day_civil_twilight_length} |
|||
\alias{day_civil_twilight_length} |
|||
\title{Length of civil twilight} |
|||
\usage{ |
|||
day_civil_twilight_length(date, lon, lat) |
|||
} |
|||
\arguments{ |
|||
\item{date}{The date to compute the length for. An R \link{DateTimeClasses} object |
|||
or something that can be coerced into one by \code{\link[=as.POSIXlt]{as.POSIXlt()}}.} |
|||
|
|||
\item{lon, lat}{longitude & latitude} |
|||
} |
|||
\value{ |
|||
(dbl) day civil twilight length |
|||
} |
|||
\description{ |
|||
Length of civil twilight |
|||
} |
|||
\examples{ |
|||
day_length("2019-12-31", -70.8636, 43.2683) |
|||
} |
|||
@ -0,0 +1,23 @@ |
|||
% Generated by roxygen2: do not edit by hand |
|||
% Please edit documentation in R/daybreak-wrappers.R |
|||
\name{day_length} |
|||
\alias{day_length} |
|||
\title{Length of day} |
|||
\usage{ |
|||
day_length(date = Sys.Date(), lon, lat) |
|||
} |
|||
\arguments{ |
|||
\item{date}{The date to compute the length for. An R \link{DateTimeClasses} object |
|||
or something that can be coerced into one by \code{\link[=as.POSIXlt]{as.POSIXlt()}}.} |
|||
|
|||
\item{lon, lat}{longitude & latitude} |
|||
} |
|||
\value{ |
|||
(dbl) length of day |
|||
} |
|||
\description{ |
|||
Length of day |
|||
} |
|||
\examples{ |
|||
day_length("2019-12-31", -70.8636, 43.2683) |
|||
} |
|||
@ -0,0 +1,23 @@ |
|||
% Generated by roxygen2: do not edit by hand |
|||
% Please edit documentation in R/daybreak-wrappers.R |
|||
\name{day_nautical_twilight_length} |
|||
\alias{day_nautical_twilight_length} |
|||
\title{Length of nautical twilight} |
|||
\usage{ |
|||
day_nautical_twilight_length(date, lon, lat) |
|||
} |
|||
\arguments{ |
|||
\item{date}{The date to compute the length for. An R \link{DateTimeClasses} object |
|||
or something that can be coerced into one by \code{\link[=as.POSIXlt]{as.POSIXlt()}}.} |
|||
|
|||
\item{lon, lat}{longitude & latitude} |
|||
} |
|||
\value{ |
|||
(dbl) day nautical twilight length |
|||
} |
|||
\description{ |
|||
Length of nautical twilight |
|||
} |
|||
\examples{ |
|||
day_nautical_twilight_length("2019-12-31", -70.8636, 43.2683) |
|||
} |
|||
@ -0,0 +1,23 @@ |
|||
% Generated by roxygen2: do not edit by hand |
|||
% Please edit documentation in R/daybreak-wrappers.R |
|||
\name{nautical_twilight} |
|||
\alias{nautical_twilight} |
|||
\title{Nautical twilight} |
|||
\usage{ |
|||
nautical_twilight(date, lon, lat) |
|||
} |
|||
\arguments{ |
|||
\item{date}{The date to compute the length for. An R \link{DateTimeClasses} object |
|||
or something that can be coerced into one by \code{\link[=as.POSIXlt]{as.POSIXlt()}}.} |
|||
|
|||
\item{lon, lat}{longitude & latitude} |
|||
} |
|||
\value{ |
|||
(dbl) nautical twilight |
|||
} |
|||
\description{ |
|||
Nautical twilight |
|||
} |
|||
\examples{ |
|||
nautical_twilight("2019-12-31", -70.8636, 43.2683) |
|||
} |
|||
@ -0,0 +1,23 @@ |
|||
% Generated by roxygen2: do not edit by hand |
|||
% Please edit documentation in R/daybreak-wrappers.R |
|||
\name{sun_rise_set} |
|||
\alias{sun_rise_set} |
|||
\title{Sun rise/set times} |
|||
\usage{ |
|||
sun_rise_set(date, lon, lat) |
|||
} |
|||
\arguments{ |
|||
\item{date}{The date to compute the length for. An R \link{DateTimeClasses} object |
|||
or something that can be coerced into one by \code{\link[=as.POSIXlt]{as.POSIXlt()}}.} |
|||
|
|||
\item{lon, lat}{longitude & latitude} |
|||
} |
|||
\value{ |
|||
(dbl) sunrise/sunset |
|||
} |
|||
\description{ |
|||
Sun rise/set times |
|||
} |
|||
\examples{ |
|||
sun_rise_set("2019-12-31", -70.8636, 43.2683) |
|||
} |
|||
@ -0,0 +1,176 @@ |
|||
#include <R.h> |
|||
#include <Rinternals.h> |
|||
|
|||
#include "sunriset.h" |
|||
|
|||
SEXP r_day_length(SEXP year, SEXP month, SEXP day, SEXP lon, SEXP lat) { |
|||
|
|||
SEXP out = PROTECT(allocVector(REALSXP, 1)); |
|||
REAL(out)[0] = day_length( |
|||
asInteger(year), asInteger(month), asInteger(day), asReal(lon), asReal(lat) |
|||
); |
|||
UNPROTECT(1); |
|||
|
|||
return(out); |
|||
|
|||
} |
|||
|
|||
SEXP r_day_civil_twilight_length(SEXP year, SEXP month, SEXP day, SEXP lon, SEXP lat) { |
|||
|
|||
SEXP out = PROTECT(allocVector(REALSXP, 1)); |
|||
REAL(out)[0] = day_civil_twilight_length( |
|||
asInteger(year), asInteger(month), asInteger(day), asReal(lon), asReal(lat) |
|||
); |
|||
UNPROTECT(1); |
|||
|
|||
return(out); |
|||
|
|||
} |
|||
|
|||
SEXP r_day_nautical_twilight_length(SEXP year, SEXP month, SEXP day, SEXP lon, SEXP lat) { |
|||
|
|||
SEXP out = PROTECT(allocVector(REALSXP, 1)); |
|||
REAL(out)[0] = day_nautical_twilight_length( |
|||
asInteger(year), asInteger(month), asInteger(day), asReal(lon), asReal(lat) |
|||
); |
|||
UNPROTECT(1); |
|||
|
|||
return(out); |
|||
|
|||
} |
|||
|
|||
SEXP r_day_astronomical_twilight_length(SEXP year, SEXP month, SEXP day, SEXP lon, SEXP lat) { |
|||
|
|||
SEXP out = PROTECT(allocVector(REALSXP, 1)); |
|||
REAL(out)[0] = day_astronomical_twilight_length( |
|||
asInteger(year), asInteger(month), asInteger(day), asReal(lon), asReal(lat) |
|||
); |
|||
UNPROTECT(1); |
|||
|
|||
return(out); |
|||
|
|||
} |
|||
|
|||
SEXP r_sun_rise_set(SEXP year, SEXP month, SEXP day, SEXP lon, SEXP lat) { |
|||
|
|||
double rise, set; |
|||
|
|||
int res = sun_rise_set( |
|||
asInteger(year), asInteger(month), asInteger(day), asReal(lon), asReal(lat), |
|||
&rise, &set |
|||
); |
|||
|
|||
const char *names[] = { |
|||
"rise", |
|||
"set", |
|||
"" |
|||
}; |
|||
|
|||
SEXP out = PROTECT(mkNamed(VECSXP, names)); |
|||
|
|||
if (res == 0) { |
|||
SET_VECTOR_ELT(out, 0, PROTECT(ScalarReal(rise))); |
|||
SET_VECTOR_ELT(out, 1, PROTECT(ScalarReal(set))); |
|||
} else { |
|||
SET_VECTOR_ELT(out, 0, PROTECT(ScalarReal(NA_REAL))); |
|||
SET_VECTOR_ELT(out, 1, PROTECT(ScalarReal(NA_REAL))); |
|||
} |
|||
|
|||
UNPROTECT(3); |
|||
|
|||
return(out); |
|||
|
|||
} |
|||
|
|||
SEXP r_civil_twilight(SEXP year, SEXP month, SEXP day, SEXP lon, SEXP lat) { |
|||
|
|||
double start, end; |
|||
|
|||
int res = civil_twilight( |
|||
asInteger(year), asInteger(month), asInteger(day), asReal(lon), asReal(lat), |
|||
&start, &end |
|||
); |
|||
|
|||
const char *names[] = { |
|||
"start", |
|||
"end", |
|||
"" |
|||
}; |
|||
|
|||
SEXP out = PROTECT(mkNamed(VECSXP, names)); |
|||
|
|||
if (res == 0) { |
|||
SET_VECTOR_ELT(out, 0, PROTECT(ScalarReal(start))); |
|||
SET_VECTOR_ELT(out, 1, PROTECT(ScalarReal(end))); |
|||
} else { |
|||
SET_VECTOR_ELT(out, 0, PROTECT(ScalarReal(NA_REAL))); |
|||
SET_VECTOR_ELT(out, 1, PROTECT(ScalarReal(NA_REAL))); |
|||
} |
|||
|
|||
UNPROTECT(3); |
|||
|
|||
return(out); |
|||
|
|||
} |
|||
|
|||
SEXP r_nautical_twilight(SEXP year, SEXP month, SEXP day, SEXP lon, SEXP lat) { |
|||
|
|||
double start, end; |
|||
|
|||
int res = nautical_twilight( |
|||
asInteger(year), asInteger(month), asInteger(day), asReal(lon), asReal(lat), |
|||
&start, &end |
|||
); |
|||
|
|||
const char *names[] = { |
|||
"start", |
|||
"end", |
|||
"" |
|||
}; |
|||
|
|||
SEXP out = PROTECT(mkNamed(VECSXP, names)); |
|||
|
|||
if (res == 0) { |
|||
SET_VECTOR_ELT(out, 0, PROTECT(ScalarReal(start))); |
|||
SET_VECTOR_ELT(out, 1, PROTECT(ScalarReal(end))); |
|||
} else { |
|||
SET_VECTOR_ELT(out, 0, PROTECT(ScalarReal(NA_REAL))); |
|||
SET_VECTOR_ELT(out, 1, PROTECT(ScalarReal(NA_REAL))); |
|||
} |
|||
|
|||
UNPROTECT(3); |
|||
|
|||
return(out); |
|||
|
|||
} |
|||
|
|||
SEXP r_astronomical_twilight(SEXP year, SEXP month, SEXP day, SEXP lon, SEXP lat) { |
|||
|
|||
double start, end; |
|||
|
|||
int res = astronomical_twilight( |
|||
asInteger(year), asInteger(month), asInteger(day), asReal(lon), asReal(lat), |
|||
&start, &end |
|||
); |
|||
|
|||
const char *names[] = { |
|||
"start", |
|||
"end", |
|||
"" |
|||
}; |
|||
|
|||
SEXP out = PROTECT(mkNamed(VECSXP, names)); |
|||
|
|||
if (res == 0) { |
|||
SET_VECTOR_ELT(out, 0, PROTECT(ScalarReal(start))); |
|||
SET_VECTOR_ELT(out, 1, PROTECT(ScalarReal(end))); |
|||
} else { |
|||
SET_VECTOR_ELT(out, 0, PROTECT(ScalarReal(NA_REAL))); |
|||
SET_VECTOR_ELT(out, 1, PROTECT(ScalarReal(NA_REAL))); |
|||
} |
|||
|
|||
UNPROTECT(3); |
|||
|
|||
return(out); |
|||
|
|||
} |
|||
@ -0,0 +1,32 @@ |
|||
#include <R.h> |
|||
#include <Rinternals.h> |
|||
#include <stdlib.h> // for NULL |
|||
#include <R_ext/Rdynload.h> |
|||
|
|||
/* .Call calls */ |
|||
extern SEXP r_astronomical_twilight(SEXP, SEXP, SEXP, SEXP, SEXP); |
|||
extern SEXP r_civil_twilight(SEXP, SEXP, SEXP, SEXP, SEXP); |
|||
extern SEXP r_day_astronomical_twilight_length(SEXP, SEXP, SEXP, SEXP, SEXP); |
|||
extern SEXP r_day_civil_twilight_length(SEXP, SEXP, SEXP, SEXP, SEXP); |
|||
extern SEXP r_day_length(SEXP, SEXP, SEXP, SEXP, SEXP); |
|||
extern SEXP r_day_nautical_twilight_length(SEXP, SEXP, SEXP, SEXP, SEXP); |
|||
extern SEXP r_nautical_twilight(SEXP, SEXP, SEXP, SEXP, SEXP); |
|||
extern SEXP r_sun_rise_set(SEXP, SEXP, SEXP, SEXP, SEXP); |
|||
|
|||
static const R_CallMethodDef CallEntries[] = { |
|||
{"r_astronomical_twilight", (DL_FUNC) &r_astronomical_twilight, 5}, |
|||
{"r_civil_twilight", (DL_FUNC) &r_civil_twilight, 5}, |
|||
{"r_day_astronomical_twilight_length", (DL_FUNC) &r_day_astronomical_twilight_length, 5}, |
|||
{"r_day_civil_twilight_length", (DL_FUNC) &r_day_civil_twilight_length, 5}, |
|||
{"r_day_length", (DL_FUNC) &r_day_length, 5}, |
|||
{"r_day_nautical_twilight_length", (DL_FUNC) &r_day_nautical_twilight_length, 5}, |
|||
{"r_nautical_twilight", (DL_FUNC) &r_nautical_twilight, 5}, |
|||
{"r_sun_rise_set", (DL_FUNC) &r_sun_rise_set, 5}, |
|||
{NULL, NULL, 0} |
|||
}; |
|||
|
|||
void R_init_daybreak(DllInfo *dll) |
|||
{ |
|||
R_registerRoutines(dll, NULL, CallEntries, NULL, NULL); |
|||
R_useDynamicSymbols(dll, FALSE); |
|||
} |
|||
@ -0,0 +1,414 @@ |
|||
/* +++Date last modified: 05-Jul-1997 */ |
|||
/* Updated comments, 05-Aug-2013 */ |
|||
|
|||
/*
|
|||
|
|||
SUNRISET.C - computes Sun rise/set times, start/end of twilight, and |
|||
the length of the day at any date and latitude |
|||
|
|||
Written as DAYLEN.C, 1989-08-16 |
|||
|
|||
Modified to SUNRISET.C, 1992-12-01 |
|||
Split to a header file, 2017-12-10, by Joachim Nilsson |
|||
|
|||
(c) Paul Schlyter, 1989, 1992 |
|||
|
|||
Released to the public domain by Paul Schlyter, December 1992 |
|||
|
|||
*/ |
|||
|
|||
#include <stdio.h> |
|||
#include <math.h> |
|||
|
|||
#include "sunriset.h" |
|||
|
|||
/* A small test program */ |
|||
// #ifndef SUNRISET_LIB
|
|||
// int main(void)
|
|||
// {
|
|||
// int year,month,day;
|
|||
// double lon, lat;
|
|||
// double daylen, civlen, nautlen, astrlen;
|
|||
// double rise, set, civ_start, civ_end, naut_start, naut_end,
|
|||
// astr_start, astr_end;
|
|||
// int rs‘, civ, naut, astr;
|
|||
// char buf[80];
|
|||
//
|
|||
// printf( "Latitude (+ is north) and longitude (+ is east) : " );
|
|||
// fgets(buf, 80, stdin);
|
|||
// sscanf(buf, "%lf %lf", &lat, &lon );
|
|||
//
|
|||
// for(;;)
|
|||
// {
|
|||
// printf( "Input date ( yyyy mm dd ) (ctrl-C exits): " );
|
|||
// fgets(buf, 80, stdin);
|
|||
// sscanf(buf, "%d %d %d", &year, &month, &day );
|
|||
//
|
|||
// daylen = day_length(year,month,day,lon,lat);
|
|||
// civlen = day_civil_twilight_length(year,month,day,lon,lat);
|
|||
// nautlen = day_nautical_twilight_length(year,month,day,lon,lat);
|
|||
// astrlen = day_astronomical_twilight_length(year,month,day,
|
|||
// lon,lat);
|
|||
//
|
|||
// printf( "Day length: %5.2f hours\n", daylen );
|
|||
// printf( "With civil twilight %5.2f hours\n", civlen );
|
|||
// printf( "With nautical twilight %5.2f hours\n", nautlen );
|
|||
// printf( "With astronomical twilight %5.2f hours\n", astrlen );
|
|||
// printf( "Length of twilight: civil %5.2f hours\n",
|
|||
// (civlen-daylen)/2.0);
|
|||
// printf( " nautical %5.2f hours\n",
|
|||
// (nautlen-daylen)/2.0);
|
|||
// printf( " astronomical %5.2f hours\n",
|
|||
// (astrlen-daylen)/2.0);
|
|||
//
|
|||
// rs = sun_rise_set ( year, month, day, lon, lat,
|
|||
// &rise, &set );
|
|||
// civ = civil_twilight ( year, month, day, lon, lat,
|
|||
// &civ_start, &civ_end );
|
|||
// naut = nautical_twilight ( year, month, day, lon, lat,
|
|||
// &naut_start, &naut_end );
|
|||
// astr = astronomical_twilight( year, month, day, lon, lat,
|
|||
// &astr_start, &astr_end );
|
|||
//
|
|||
// printf( "Sun at south %5.2fh UT\n", (rise+set)/2.0 );
|
|||
//
|
|||
// switch( rs )
|
|||
// {
|
|||
// case 0:
|
|||
// printf( "Sun rises %5.2fh UT, sets %5.2fh UT\n",
|
|||
// rise, set );
|
|||
// break;
|
|||
// case +1:
|
|||
// printf( "Sun above horizon\n" );
|
|||
// break;
|
|||
// case -1:
|
|||
// printf( "Sun below horizon\n" );
|
|||
// break;
|
|||
// }
|
|||
//
|
|||
// switch( civ )
|
|||
// {
|
|||
// case 0:
|
|||
// printf( "Civil twilight starts %5.2fh, "
|
|||
// "ends %5.2fh UT\n", civ_start, civ_end );
|
|||
// break;
|
|||
// case +1:
|
|||
// printf( "Never darker than civil twilight\n" );
|
|||
// break;
|
|||
// case -1:
|
|||
// printf( "Never as bright as civil twilight\n" );
|
|||
// break;
|
|||
// }
|
|||
//
|
|||
// switch( naut )
|
|||
// {
|
|||
// case 0:
|
|||
// printf( "Nautical twilight starts %5.2fh, "
|
|||
// "ends %5.2fh UT\n", naut_start, naut_end );
|
|||
// break;
|
|||
// case +1:
|
|||
// printf( "Never darker than nautical twilight\n" );
|
|||
// break;
|
|||
// case -1:
|
|||
// printf( "Never as bright as nautical twilight\n" );
|
|||
// break;
|
|||
// }
|
|||
//
|
|||
// switch( astr )
|
|||
// {
|
|||
// case 0:
|
|||
// printf( "Astronomical twilight starts %5.2fh, "
|
|||
// "ends %5.2fh UT\n", astr_start, astr_end );
|
|||
// break;
|
|||
// case +1:
|
|||
// printf( "Never darker than astronomical twilight\n" );
|
|||
// break;
|
|||
// case -1:
|
|||
// printf( "Never as bright as astronomical twilight\n" );
|
|||
// break;
|
|||
// }
|
|||
// return 0;
|
|||
// }
|
|||
// }
|
|||
// #endif /* SUNRISET_LIB */
|
|||
|
|||
/* The "workhorse" function for sun rise/set times */ |
|||
|
|||
int __sunriset__( int year, int month, int day, double lon, double lat, |
|||
double altit, int upper_limb, double *trise, double *tset ) |
|||
/***************************************************************************/ |
|||
/* Note: year,month,date = calendar date, 1801-2099 only. */ |
|||
/* Eastern longitude positive, Western longitude negative */ |
|||
/* Northern latitude positive, Southern latitude negative */ |
|||
/* The longitude value IS critical in this function! */ |
|||
/* altit = the altitude which the Sun should cross */ |
|||
/* Set to -35/60 degrees for rise/set, -6 degrees */ |
|||
/* for civil, -12 degrees for nautical and -18 */ |
|||
/* degrees for astronomical twilight. */ |
|||
/* upper_limb: non-zero -> upper limb, zero -> center */ |
|||
/* Set to non-zero (e.g. 1) when computing rise/set */ |
|||
/* times, and to zero when computing start/end of */ |
|||
/* twilight. */ |
|||
/* *rise = where to store the rise time */ |
|||
/* *set = where to store the set time */ |
|||
/* Both times are relative to the specified altitude, */ |
|||
/* and thus this function can be used to compute */ |
|||
/* various twilight times, as well as rise/set times */ |
|||
/* Return value: 0 = sun rises/sets this day, times stored at */ |
|||
/* *trise and *tset. */ |
|||
/* +1 = sun above the specified "horizon" 24 hours. */ |
|||
/* *trise set to time when the sun is at south, */ |
|||
/* minus 12 hours while *tset is set to the south */ |
|||
/* time plus 12 hours. "Day" length = 24 hours */ |
|||
/* -1 = sun is below the specified "horizon" 24 hours */ |
|||
/* "Day" length = 0 hours, *trise and *tset are */ |
|||
/* both set to the time when the sun is at south. */ |
|||
/* */ |
|||
/**********************************************************************/ |
|||
{ |
|||
double d, /* Days since 2000 Jan 0.0 (negative before) */ |
|||
sr, /* Solar distance, astronomical units */ |
|||
sRA, /* Sun's Right Ascension */ |
|||
sdec, /* Sun's declination */ |
|||
sradius, /* Sun's apparent radius */ |
|||
t, /* Diurnal arc */ |
|||
tsouth, /* Time when Sun is at south */ |
|||
sidtime; /* Local sidereal time */ |
|||
|
|||
int rc = 0; /* Return cde from function - usually 0 */ |
|||
|
|||
/* Compute d of 12h local mean solar time */ |
|||
d = days_since_2000_Jan_0(year,month,day) + 0.5 - lon/360.0; |
|||
|
|||
/* Compute the local sidereal time of this moment */ |
|||
sidtime = revolution( GMST0(d) + 180.0 + lon ); |
|||
|
|||
/* Compute Sun's RA, Decl and distance at this moment */ |
|||
sun_RA_dec( d, &sRA, &sdec, &sr ); |
|||
|
|||
/* Compute time when Sun is at south - in hours UT */ |
|||
tsouth = 12.0 - rev180(sidtime - sRA)/15.0; |
|||
|
|||
/* Compute the Sun's apparent radius in degrees */ |
|||
sradius = 0.2666 / sr; |
|||
|
|||
/* Do correction to upper limb, if necessary */ |
|||
if ( upper_limb ) |
|||
altit -= sradius; |
|||
|
|||
/* Compute the diurnal arc that the Sun traverses to reach */ |
|||
/* the specified altitude altit: */ |
|||
{ |
|||
double cost; |
|||
cost = ( sind(altit) - sind(lat) * sind(sdec) ) / |
|||
( cosd(lat) * cosd(sdec) ); |
|||
if ( cost >= 1.0 ) |
|||
rc = -1, t = 0.0; /* Sun always below altit */ |
|||
else if ( cost <= -1.0 ) |
|||
rc = +1, t = 12.0; /* Sun always above altit */ |
|||
else |
|||
t = acosd(cost)/15.0; /* The diurnal arc, hours */ |
|||
} |
|||
|
|||
/* Store rise and set times - in hours UT */ |
|||
*trise = tsouth - t; |
|||
*tset = tsouth + t; |
|||
|
|||
return rc; |
|||
} /* __sunriset__ */ |
|||
|
|||
|
|||
|
|||
/* The "workhorse" function */ |
|||
|
|||
|
|||
double __daylen__( int year, int month, int day, double lon, double lat, |
|||
double altit, int upper_limb ) |
|||
/**********************************************************************/ |
|||
/* Note: year,month,date = calendar date, 1801-2099 only. */ |
|||
/* Eastern longitude positive, Western longitude negative */ |
|||
/* Northern latitude positive, Southern latitude negative */ |
|||
/* The longitude value is not critical. Set it to the correct */ |
|||
/* longitude if you're picky, otherwise set to to, say, 0.0 */ |
|||
/* The latitude however IS critical - be sure to get it correct */ |
|||
/* altit = the altitude which the Sun should cross */ |
|||
/* Set to -35/60 degrees for rise/set, -6 degrees */ |
|||
/* for civil, -12 degrees for nautical and -18 */ |
|||
/* degrees for astronomical twilight. */ |
|||
/* upper_limb: non-zero -> upper limb, zero -> center */ |
|||
/* Set to non-zero (e.g. 1) when computing day length */ |
|||
/* and to zero when computing day+twilight length. */ |
|||
/**********************************************************************/ |
|||
{ |
|||
double d, /* Days since 2000 Jan 0.0 (negative before) */ |
|||
obl_ecl, /* Obliquity (inclination) of Earth's axis */ |
|||
sr, /* Solar distance, astronomical units */ |
|||
slon, /* True solar longitude */ |
|||
sin_sdecl, /* Sine of Sun's declination */ |
|||
cos_sdecl, /* Cosine of Sun's declination */ |
|||
sradius, /* Sun's apparent radius */ |
|||
t; /* Diurnal arc */ |
|||
|
|||
/* Compute d of 12h local mean solar time */ |
|||
d = days_since_2000_Jan_0(year,month,day) + 0.5 - lon/360.0; |
|||
|
|||
/* Compute obliquity of ecliptic (inclination of Earth's axis) */ |
|||
obl_ecl = 23.4393 - 3.563E-7 * d; |
|||
|
|||
/* Compute Sun's ecliptic longitude and distance */ |
|||
sunpos( d, &slon, &sr ); |
|||
|
|||
/* Compute sine and cosine of Sun's declination */ |
|||
sin_sdecl = sind(obl_ecl) * sind(slon); |
|||
cos_sdecl = sqrt( 1.0 - sin_sdecl * sin_sdecl ); |
|||
|
|||
/* Compute the Sun's apparent radius, degrees */ |
|||
sradius = 0.2666 / sr; |
|||
|
|||
/* Do correction to upper limb, if necessary */ |
|||
if ( upper_limb ) |
|||
altit -= sradius; |
|||
|
|||
/* Compute the diurnal arc that the Sun traverses to reach */ |
|||
/* the specified altitude altit: */ |
|||
{ |
|||
double cost; |
|||
cost = ( sind(altit) - sind(lat) * sin_sdecl ) / |
|||
( cosd(lat) * cos_sdecl ); |
|||
if ( cost >= 1.0 ) |
|||
t = 0.0; /* Sun always below altit */ |
|||
else if ( cost <= -1.0 ) |
|||
t = 24.0; /* Sun always above altit */ |
|||
else t = (2.0/15.0) * acosd(cost); /* The diurnal arc, hours */ |
|||
} |
|||
return t; |
|||
} /* __daylen__ */ |
|||
|
|||
|
|||
/* This function computes the Sun's position at any instant */ |
|||
|
|||
void sunpos( double d, double *lon, double *r ) |
|||
/******************************************************/ |
|||
/* Computes the Sun's ecliptic longitude and distance */ |
|||
/* at an instant given in d, number of days since */ |
|||
/* 2000 Jan 0.0. The Sun's ecliptic latitude is not */ |
|||
/* computed, since it's always very near 0. */ |
|||
/******************************************************/ |
|||
{ |
|||
double M, /* Mean anomaly of the Sun */ |
|||
w, /* Mean longitude of perihelion */ |
|||
/* Note: Sun's mean longitude = M + w */ |
|||
e, /* Eccentricity of Earth's orbit */ |
|||
E, /* Eccentric anomaly */ |
|||
x, y, /* x, y coordinates in orbit */ |
|||
v; /* True anomaly */ |
|||
|
|||
/* Compute mean elements */ |
|||
M = revolution( 356.0470 + 0.9856002585 * d ); |
|||
w = 282.9404 + 4.70935E-5 * d; |
|||
e = 0.016709 - 1.151E-9 * d; |
|||
|
|||
/* Compute true longitude and radius vector */ |
|||
E = M + e * RADEG * sind(M) * ( 1.0 + e * cosd(M) ); |
|||
x = cosd(E) - e; |
|||
y = sqrt( 1.0 - e*e ) * sind(E); |
|||
*r = sqrt( x*x + y*y ); /* Solar distance */ |
|||
v = atan2d( y, x ); /* True anomaly */ |
|||
*lon = v + w; /* True solar longitude */ |
|||
if ( *lon >= 360.0 ) |
|||
*lon -= 360.0; /* Make it 0..360 degrees */ |
|||
} |
|||
|
|||
void sun_RA_dec( double d, double *RA, double *dec, double *r ) |
|||
/******************************************************/ |
|||
/* Computes the Sun's equatorial coordinates RA, Decl */ |
|||
/* and also its distance, at an instant given in d, */ |
|||
/* the number of days since 2000 Jan 0.0. */ |
|||
/******************************************************/ |
|||
{ |
|||
double lon, obl_ecl, x, y, z; |
|||
|
|||
/* Compute Sun's ecliptical coordinates */ |
|||
sunpos( d, &lon, r ); |
|||
|
|||
/* Compute ecliptic rectangular coordinates (z=0) */ |
|||
x = *r * cosd(lon); |
|||
y = *r * sind(lon); |
|||
|
|||
/* Compute obliquity of ecliptic (inclination of Earth's axis) */ |
|||
obl_ecl = 23.4393 - 3.563E-7 * d; |
|||
|
|||
/* Convert to equatorial rectangular coordinates - x is unchanged */ |
|||
z = y * sind(obl_ecl); |
|||
y = y * cosd(obl_ecl); |
|||
|
|||
/* Convert to spherical coordinates */ |
|||
*RA = atan2d( y, x ); |
|||
*dec = atan2d( z, sqrt(x*x + y*y) ); |
|||
|
|||
} /* sun_RA_dec */ |
|||
|
|||
|
|||
/******************************************************************/ |
|||
/* This function reduces any angle to within the first revolution */ |
|||
/* by subtracting or adding even multiples of 360.0 until the */ |
|||
/* result is >= 0.0 and < 360.0 */ |
|||
/******************************************************************/ |
|||
|
|||
#define INV360 ( 1.0 / 360.0 ) |
|||
|
|||
double revolution( double x ) |
|||
/*****************************************/ |
|||
/* Reduce angle to within 0..360 degrees */ |
|||
/*****************************************/ |
|||
{ |
|||
return( x - 360.0 * floor( x * INV360 ) ); |
|||
} /* revolution */ |
|||
|
|||
double rev180( double x ) |
|||
/*********************************************/ |
|||
/* Reduce angle to within +180..+180 degrees */ |
|||
/*********************************************/ |
|||
{ |
|||
return( x - 360.0 * floor( x * INV360 + 0.5 ) ); |
|||
} /* revolution */ |
|||
|
|||
|
|||
/*******************************************************************/ |
|||
/* This function computes GMST0, the Greenwich Mean Sidereal Time */ |
|||
/* at 0h UT (i.e. the sidereal time at the Greenwich meridian at */ |
|||
/* 0h UT). GMST is then the sidereal time at Greenwich at any */ |
|||
/* time of the day. I've generalized GMST0 as well, and define it */ |
|||
/* as: GMST0 = GMST - UT -- this allows GMST0 to be computed at */ |
|||
/* other times than 0h UT as well. While this sounds somewhat */ |
|||
/* contradictory, it is very practical: instead of computing */ |
|||
/* GMST like: */ |
|||
/* */ |
|||
/* GMST = (GMST0) + UT * (366.2422/365.2422) */ |
|||
/* */ |
|||
/* where (GMST0) is the GMST last time UT was 0 hours, one simply */ |
|||
/* computes: */ |
|||
/* */ |
|||
/* GMST = GMST0 + UT */ |
|||
/* */ |
|||
/* where GMST0 is the GMST "at 0h UT" but at the current moment! */ |
|||
/* Defined in this way, GMST0 will increase with about 4 min a */ |
|||
/* day. It also happens that GMST0 (in degrees, 1 hr = 15 degr) */ |
|||
/* is equal to the Sun's mean longitude plus/minus 180 degrees! */ |
|||
/* (if we neglect aberration, which amounts to 20 seconds of arc */ |
|||
/* or 1.33 seconds of time) */ |
|||
/* */ |
|||
/*******************************************************************/ |
|||
|
|||
double GMST0( double d ) |
|||
{ |
|||
double sidtim0; |
|||
/* Sidtime at 0h UT = L (Sun's mean longitude) + 180.0 degr */ |
|||
/* L = M + w, as defined in sunpos(). Since I'm too lazy to */ |
|||
/* add these numbers, I'll let the C compiler do it for me. */ |
|||
/* Any decent C compiler will add the constants at compile */ |
|||
/* time, imposing no runtime or code overhead. */ |
|||
sidtim0 = revolution( ( 180.0 + 356.0470 + 282.9404 ) + |
|||
( 0.9856002585 + 4.70935E-5 ) * d ); |
|||
return sidtim0; |
|||
} /* GMST0 */ |
|||
@ -0,0 +1,118 @@ |
|||
/*
|
|||
|
|||
SUNRISET.H - computes Sun rise/set times, start/end of twilight, and |
|||
the length of the day at any date and latitude |
|||
|
|||
Written as DAYLEN.C, 1989-08-16 |
|||
|
|||
Modified to SUNRISET.C, 1992-12-01 |
|||
Split to a header file, 2017-12-10, by Joachim Nilsson |
|||
|
|||
(c) Paul Schlyter, 1989, 1992 |
|||
|
|||
Released to the public domain by Paul Schlyter, December 1992 |
|||
|
|||
*/ |
|||
|
|||
/* A macro to compute the number of days elapsed since 2000 Jan 0.0 */ |
|||
/* (which is equal to 1999 Dec 31, 0h UT) */ |
|||
|
|||
#define days_since_2000_Jan_0(y,m,d) \ |
|||
(367L*(y)-((7*((y)+(((m)+9)/12)))/4)+((275*(m))/9)+(d)-730530L) |
|||
|
|||
/* Some conversion factors between radians and degrees */ |
|||
|
|||
#ifndef PI |
|||
#define PI 3.1415926535897932384 |
|||
#endif |
|||
|
|||
#define RADEG ( 180.0 / PI ) |
|||
#define DEGRAD ( PI / 180.0 ) |
|||
|
|||
/* The trigonometric functions in degrees */ |
|||
|
|||
#define sind(x) sin((x)*DEGRAD) |
|||
#define cosd(x) cos((x)*DEGRAD) |
|||
#define tand(x) tan((x)*DEGRAD) |
|||
|
|||
#define atand(x) (RADEG*atan(x)) |
|||
#define asind(x) (RADEG*asin(x)) |
|||
#define acosd(x) (RADEG*acos(x)) |
|||
#define atan2d(y,x) (RADEG*atan2(y,x)) |
|||
|
|||
|
|||
/* Following are some macros around the "workhorse" function __daylen__ */ |
|||
/* They mainly fill in the desired values for the reference altitude */ |
|||
/* below the horizon, and also selects whether this altitude should */ |
|||
/* refer to the Sun's center or its upper limb. */ |
|||
|
|||
|
|||
/* This macro computes the length of the day, from sunrise to sunset. */ |
|||
/* Sunrise/set is considered to occur when the Sun's upper limb is */ |
|||
/* 35 arc minutes below the horizon (this accounts for the refraction */ |
|||
/* of the Earth's atmosphere). */ |
|||
#define day_length(year,month,day,lon,lat) \ |
|||
__daylen__( year, month, day, lon, lat, -35.0/60.0, 1 ) |
|||
|
|||
/* This macro computes the length of the day, including civil twilight. */ |
|||
/* Civil twilight starts/ends when the Sun's center is 6 degrees below */ |
|||
/* the horizon. */ |
|||
#define day_civil_twilight_length(year,month,day,lon,lat) \ |
|||
__daylen__( year, month, day, lon, lat, -6.0, 0 ) |
|||
|
|||
/* This macro computes the length of the day, incl. nautical twilight. */ |
|||
/* Nautical twilight starts/ends when the Sun's center is 12 degrees */ |
|||
/* below the horizon. */ |
|||
#define day_nautical_twilight_length(year,month,day,lon,lat) \ |
|||
__daylen__( year, month, day, lon, lat, -12.0, 0 ) |
|||
|
|||
/* This macro computes the length of the day, incl. astronomical twilight. */ |
|||
/* Astronomical twilight starts/ends when the Sun's center is 18 degrees */ |
|||
/* below the horizon. */ |
|||
#define day_astronomical_twilight_length(year,month,day,lon,lat) \ |
|||
__daylen__( year, month, day, lon, lat, -18.0, 0 ) |
|||
|
|||
|
|||
/* This macro computes times for sunrise/sunset. */ |
|||
/* Sunrise/set is considered to occur when the Sun's upper limb is */ |
|||
/* 35 arc minutes below the horizon (this accounts for the refraction */ |
|||
/* of the Earth's atmosphere). */ |
|||
#define sun_rise_set(year,month,day,lon,lat,rise,set) \ |
|||
__sunriset__( year, month, day, lon, lat, -35.0/60.0, 1, rise, set ) |
|||
|
|||
/* This macro computes the start and end times of civil twilight. */ |
|||
/* Civil twilight starts/ends when the Sun's center is 6 degrees below */ |
|||
/* the horizon. */ |
|||
#define civil_twilight(year,month,day,lon,lat,start,end) \ |
|||
__sunriset__( year, month, day, lon, lat, -6.0, 0, start, end ) |
|||
|
|||
/* This macro computes the start and end times of nautical twilight. */ |
|||
/* Nautical twilight starts/ends when the Sun's center is 12 degrees */ |
|||
/* below the horizon. */ |
|||
#define nautical_twilight(year,month,day,lon,lat,start,end) \ |
|||
__sunriset__( year, month, day, lon, lat, -12.0, 0, start, end ) |
|||
|
|||
/* This macro computes the start and end times of astronomical twilight. */ |
|||
/* Astronomical twilight starts/ends when the Sun's center is 18 degrees */ |
|||
/* below the horizon. */ |
|||
#define astronomical_twilight(year,month,day,lon,lat,start,end) \ |
|||
__sunriset__( year, month, day, lon, lat, -18.0, 0, start, end ) |
|||
|
|||
|
|||
/* Function prototypes */ |
|||
|
|||
double __daylen__( int year, int month, int day, double lon, double lat, |
|||
double altit, int upper_limb ); |
|||
|
|||
int __sunriset__( int year, int month, int day, double lon, double lat, |
|||
double altit, int upper_limb, double *rise, double *set ); |
|||
|
|||
void sunpos( double d, double *lon, double *r ); |
|||
|
|||
void sun_RA_dec( double d, double *RA, double *dec, double *r ); |
|||
|
|||
double revolution( double x ); |
|||
|
|||
double rev180( double x ); |
|||
|
|||
double GMST0( double d ); |
|||
@ -0,0 +1,5 @@ |
|||
|
|||
if ( requireNamespace("tinytest", quietly=TRUE) ){ |
|||
tinytest::test_package("daybreak") |
|||
} |
|||
|
|||
Loading…
Reference in new issue