diff --git a/R/terminator_lat_lon.R b/R/terminator_lat_lon.R
index 826fa84..0c2fe2f 100644
--- a/R/terminator_lat_lon.R
+++ b/R/terminator_lat_lon.R
@@ -1,11 +1,16 @@
 #' Generate a full set of terminator frames
 #'
-#' @param day,from,to,by setup for the hours sequence
+#' @param day,hrs_from,hrs_to,hrs_by setup for the hours sequence
+#' @param lon_from,lon_to,lon_by latitude sequence setup
 #' @export
-terminator_lat_lon <- function(day = Sys.Date(), from=0, to=23, by=1) {
+terminator_lat_lon <- function(day = Sys.Date(), hrs_from=0, hrs_to=23, hrs_by=1,
+                               lon_from=-180, lon_to=190, lon_by=0.5) {
 
-  purrr::map_df(seq(0, 23, 1), ~{
-    out <- terminator(as.integer((as.POSIXct(day) + (60*60*.x))), -180, 190, 0.5)
+  purrr::map_df(seq(hrs_from, hrs_to, hrs_by), ~{
+    terminator(
+      as.integer((as.POSIXct(day) + (60*60*.x))),
+      -lon_from, lon_to, lon_by
+    ) -> out
     out$frame <- .x
     out
   })
diff --git a/man/terminator_lat_lon.Rd b/man/terminator_lat_lon.Rd
index 52db851..957330c 100644
--- a/man/terminator_lat_lon.Rd
+++ b/man/terminator_lat_lon.Rd
@@ -4,10 +4,13 @@
 \alias{terminator_lat_lon}
 \title{Generate a full set of terminator frames}
 \usage{
-terminator_lat_lon(day = Sys.Date(), from = 0, to = 23, by = 1)
+terminator_lat_lon(day = Sys.Date(), hrs_from = 0, hrs_to = 23,
+  hrs_by = 1, lon_from = -180, lon_to = 190, lon_by = 0.5)
 }
 \arguments{
-\item{day, from, to, by}{setup for the hours sequence}
+\item{day, hrs_from, hrs_to, hrs_by}{setup for the hours sequence}
+
+\item{lon_from, lon_to, lon_by}{latitude sequence setup}
 }
 \description{
 Generate a full set of terminator frames
diff --git a/src/terminator-main.cpp b/src/terminator-main.cpp
index 7b0b676..7fe8b27 100644
--- a/src/terminator-main.cpp
+++ b/src/terminator-main.cpp
@@ -49,8 +49,9 @@ inline double ecliptic_obliquity(double j_day) {
         T * (0.0001831 / 3600.0 +
           T * (0.00200340 / 3600.0 -
             T * (0.576e-6 / 3600.0 -
-              T * 4.34e-8 / 3600.0)
+              T * 4.34e-8 / 3600.0
             )
+          )
         )
       )
   );
@@ -137,7 +138,7 @@ DataFrame terminator(int time, double from = -180, double to = 180, double by =
     _["lon"] = out_lon
   );
 
-  df.attr("class") = CharacterVector::create("tbl_df", "tbl", "data.frame");
+  df.attr("class") = CharacterVector::create("terminator_df", "tbl_df", "tbl", "data.frame");
 
   return(df);