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# NAME

DateTime::Astro - Functions For Astromical Calendars

# DESCRIPTION

DateTime::Astro implements functions used in astronomical calendars, such
as calculation of lunar longitudea and solar longitude.

This module is best used in environments where a C compiler and the MPFR arbitrary precision math library is installed. It can fallback to using Math::BigInt, but that would pretty much render it useless because of its speed and loss of accuracy that...

# DISCLAIMER

This module works, but there are several caveats you should be aware of:

## MPFR Is Required / PurePerl Version Not Functional

lib/DateTime/Astro.pm  view on Meta::CPAN

1;

__END__

=head1 NAME

DateTime::Astro - Functions For Astromical Calendars

=head1 DESCRIPTION

DateTime::Astro implements functions used in astronomical calendars, such
as calculation of lunar longitudea and solar longitude.

This module is best used in environments where a C compiler and the MPFR arbitrary precision math library is installed. It can fallback to using Math::BigInt, but that would pretty much render it useless because of its speed and loss of accuracy that...

=head1 DISCLAIMER

This module works, but there are several caveats you should be aware of:

=head2 MPFR Is Required / PurePerl Version Not Functional

xs/dt_astro_lunar.inc  view on Meta::CPAN

        dt_astro_global_cache.cache[n_int] = new_data;
#if (0)
        PerlIO_printf(PerlIO_stderr(), "CACHE set for %d\n", n_int);
#endif
    }

    return 1;
}

/* TODO: Check out errata 269 on 
    http://emr.cs.uiuc.edu/home/reingold/calendar-book/second-edition/errata.pdf
*/
STATIC_INLINE
int
new_moon_before_from_moment(mpfr_t *result, mpfr_t *o_moment) {
    mpfr_t t0, phi, big_n, radian, delta;
    mpfr_t fullangle;
    long n;

    mpfr_init(t0);
    nth_new_moon(&t0, 0);