Time-Keeper-Sun

Sunrise, sunset, twilight, solar noon, moonrise, moonset and the moon's phase, for a
place and a day, in a time zone, as Time::Keeper values.

Time::Keeper::Sun gives the moments the sun rises, sets, reaches its height and passes
through the three depths of twilight on a civil day at a place; the sun's altitude and
bearing at an instant; the equinoxes and solstices; and, in Time::Keeper::Moon, the
phases of the moon, its place, its age, the fraction lit, and the moments it rises and
sets. A day is the zone's own day, 23, 24 or 25 hours where the clocks change, and it
holds whatever crossings fall in it, which near the poles can be two sunsets or none.
The astronomy is Meeus's; the results are measured against the U.S. Naval Observatory's
published data and the Jet Propulsion Laboratory's ephemeris, and the POD says how close
they come.

    use Time::Keeper::Sun;

    my $sun = Time::Keeper::Sun->new(latitude => 51.5074, longitude => -0.1278,
                                     zone => 'Europe/London');
    my $day = $sun->on(year => 2026, month => 10, day => 15);
    print $day->sunrise, "\n";      # 2026-10-15T07:24:22+01:00
    print $day->sunset, "\n";       # 2026-10-15T18:07:21+01:00

INSTALLATION

Time::Keeper must be installed first: this distribution is configured against the C
header it installs. Then:

    perl Makefile.PL
    make
    make test
    make install

SUPPORT AND DOCUMENTATION

After installing, you can find documentation for this module with the perldoc command.

    perldoc Time::Keeper::Sun
    perldoc Time::Keeper::Moon

LICENSE AND COPYRIGHT

This software is Copyright (c) 2026 by LNATION.

This is free software, licensed under:

  The Artistic License 2.0 (GPL Compatible)