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authorMattias Andrée <maandree@operamail.com>2014-02-24 19:11:29 +0100
committerMattias Andrée <maandree@operamail.com>2014-02-24 19:11:33 +0100
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and twilight solar elevation constants
Signed-off-by: Mattias Andrée <maandree@operamail.com>
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@@ -900,6 +900,43 @@ time in Julian Centuries. All parameters are floating point
and may not be @code{None}, except for in @code{solar_elevation},
as specified.
+Blueshift provides constants with important elevations of
+the Sun during twilight.
+
+@table @code
+@item SOLAR_ELEVATION_SUNSET_SUNRISE
+The Sun's elevation at sunset and sunrise,
+measured in degrees.
+
+@item SOLAR_ELEVATION_CIVIL_DUSK_DAWN
+The Sun's elevation at civil dusk and civil dawn,
+measured in degrees.
+
+@item SOLAR_ELEVATION_NAUTICAL_DUSK_DAWN
+The Sun's elevation at nautical dusk and nautical
+dawn, measured in degrees.
+
+@item SOLAR_ELEVATION_ASTRONOMICAL_DUSK_DAWN
+The Sun's elevation at astronomical dusk and
+astronomical dawn, measured in degrees.
+
+@item SOLAR_ELEVATION_RANGE_TWILIGHT
+The Sun's lowest and highest elevation during all
+periods of twilight, measured in degrees.
+
+@item SOLAR_ELEVATION_RANGE_CIVIL_TWILIGHT
+The Sun's lowest and highest elevation during
+civil twilight, measured in degrees.
+
+@item SOLAR_ELEVATION_RANGE_NAUTICAL_TWILIGHT
+The Sun's lowest and highest elevation during
+nautical twilight, measured in degrees.
+
+@item SOLAR_ELEVATION_RANGE_ASTRONOMICAL_TWILIGHT
+The Sun's lowest and highest elevation during
+astronomical twilight, measured in degrees.
+@end table
+
@node Terminology