daybreak

Compute Sun Rise/Set Times, Start/End of Twilight, and the Length of the Day at Any Date and Latitude

Description

A wrapper for Paul Schlyter’s C-based library for computing sunrise, sunset, twilight start and end, plus the length of day for a given data and coordinates.

What’s Inside The Tin

The following functions are implemented:

• astronomical_twilight: Astronomical twilight
• civil_twilight: Civil twilight
• day_astronomical_twilight_length: Length of astronomical twilight
• day_civil_twilight_length: Length of civil twilight
• day_length: Length of day
• day_nautical_twilight_length: Length of nautical twilight
• nautical_twilight: Nautical twilight
• sun_rise_set: Sun rise/set times

Installation

install.packages("daybreak", repos = "https://cinc.rud.is")
# or
remotes::install_git("https://git.rud.is/hrbrmstr/daybreak.git")
# or
remotes::install_git("https://git.sr.ht/~hrbrmstr/daybreak")
# or
remotes::install_gitlab("hrbrmstr/daybreak")
# or
remotes::install_bitbucket("hrbrmstr/daybreak")
# or
remotes::install_github("hrbrmstr/daybreak")

NOTE: To use the ‘remotes’ install options you will need to have the {remotes} package installed.

Usage

library(daybreak)

# current version
packageVersion("daybreak")
## [1] '0.1.0'

Near me:

day_length("2019-12-31", -70.8636, 43.2683)
## [1] 9.031444
day_civil_twilight_length("2019-12-31", -70.8636, 43.2683)
## [1] 10.10834
day_nautical_twilight_length("2019-12-31", -70.8636, 43.2683)
## [1] 11.30569
day_astronomical_twilight_length("2019-12-31", -70.8636, 43.2683)
## [1] 12.45998
sun_rise_set("2019-12-31", -70.8636, 43.2683)
## $rise
## [1] 12.25761
## 
## $set
## [1] 21.28906
civil_twilight("2019-12-31", -70.8636, 43.2683)
## $start
## [1] 11.71917
## 
## $end
## [1] 21.82751
nautical_twilight("2019-12-31", -70.8636, 43.2683)
## $start
## [1] 11.12049
## 
## $end
## [1] 22.42618
astronomical_twilight("2019-12-31", -70.8636, 43.2683)
## $start
## [1] 10.54335
## 
## $end
## [1] 23.00332

Tromsø, Norway (Winter)

day_length("2019-12-31", 18.9553, 69.6492)
## [1] 0
day_civil_twilight_length("2019-12-31", 18.9553, 69.6492)
## [1] 4.613116
day_nautical_twilight_length("2019-12-31", 18.9553, 69.6492)
## [1] 8.000323
day_astronomical_twilight_length("2019-12-31", 18.9553, 69.6492)
## [1] 10.5871
sun_rise_set("2019-12-31", 18.9553, 69.6492)
## $rise
## [1] NA
## 
## $set
## [1] NA
civil_twilight("2019-12-31", 18.9553, 69.6492)
## $start
## [1] 8.476866
## 
## $end
## [1] 13.08998
nautical_twilight("2019-12-31", 18.9553, 69.6492)
## $start
## [1] 6.783262
## 
## $end
## [1] 14.78359
astronomical_twilight("2019-12-31", 18.9553, 69.6492)
## $start
## [1] 5.489872
## 
## $end
## [1] 16.07698

Tromsø, Norway (Summer)

day_length("2019-06-01", 18.9553, 69.6492)
## [1] 24
day_civil_twilight_length("2019-06-01", 18.9553, 69.6492)
## [1] 24
day_nautical_twilight_length("2019-06-01", 18.9553, 69.6492)
## [1] 24
day_astronomical_twilight_length("2019-06-01", 18.9553, 69.6492)
## [1] 24
sun_rise_set("2019-06-01", 18.9553, 69.6492)
## $rise
## [1] NA
## 
## $set
## [1] NA
civil_twilight("2019-06-01", 18.9553, 69.6492)
## $start
## [1] NA
## 
## $end
## [1] NA
nautical_twilight("2019-06-01", 18.9553, 69.6492)
## $start
## [1] NA
## 
## $end
## [1] NA
astronomical_twilight("2019-06-01", 18.9553, 69.6492)
## $start
## [1] NA
## 
## $end
## [1] NA

daybreak Metrics

Lang	# Files	(%)	LoC	(%)	Blank lines	(%)	# Lines	(%)
C	3	0.33	267	0.66	110	0.60	245	0.60
R	4	0.44	65	0.16	16	0.09	84	0.20
C/C++ Header	1	0.11	39	0.10	35	0.19	44	0.11
Rmd	1	0.11	32	0.08	21	0.12	37	0.09

Code of Conduct

Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.