Astro::Coord::ECI::Sun is a Perl module to compute the position of the Sun.

SYNOPSIS

 use Astro::Coord::ECI;
 use Astro::Coord::ECI::Sun;
 use Astro::Coord::ECI::Utils qw{deg2rad};
 
 # 1600 Pennsylvania Ave, Washington DC USA
 # latitude 38.899 N, longitude 77.038 W,
 # altitude 16.68 meters above sea level
 my $lat = deg2rad (38.899); # Radians
 my $long = deg2rad (-77.038); # Radians
 my $alt = 16.68 / 1000; # Kilometers
 my $sun = Astro::Coord::ECI::Sun->new ();
 my $sta = Astro::Coord::ECI->
 universal (time ())->
 geodetic ($lat, $long, $alt);
 my ($time, $rise) = $sta->next_elevation ($sun);
 print "Sun @{[$rise ? 'rise' : 'set']} is ",
 scalar localtime $time, "
";

This module implements the position of the Sun as a function of time, as described in Jean Meeus' "Astronomical Algorithms," second edition. It is a subclass of Astro::Coord::ECI, with the id, name, and diameter attributes initialized appropriately, and the time_set() method overridden to compute the position of the Sun at the given time.


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Requirements:

· Perl