polar_night | R Documentation |
Provides the true solar longitude (in degrees) of the beginning and end of the polar night for a given latitude and orbit
polar_night(lat, orbit)
lat |
latitude |
orbit |
Output from a solution, such as |
Either a message about the absence of polar night (for specified reasons), or the true solar longitude, in degrees, of the beginning and end of the polar night.
Michel Crucifix, U. catholique de Louvain, Belgium.
any standard text book of spherical astronomy
current_orbit <- la04(0)
# polar night at the equator ?
polar_night (0, current_orbit)
# polar night at 80 N ?
polar_night (80*pi/180, current_orbit)
# polar nights expressed as day of year
l2day(current_orbit, polar_night (80*pi/180, current_orbit))
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