NAME

Astro::Montenbruck::CoCo - Coordinates conversions.

VERSION

Version 0.01

DESCRIPTION

Celestial sphera related calculations used by AstroScript modules.

EXPORT

• "equ2ecl($alpha, $delta, $epsilon)"

• "ecl2equ($lambda, $beta, $epsilon)"

FUNCTIONS

equ2ecl($alpha, $delta, $epsilon)

Conversion of equatorial into ecliptic coordinates

Arguments

• $alpha — right ascension

• $delta — declination

• $epsilon — ecliptic obliquity

Returns

Ecliptic coordinates:

• $lambda

• $beta

All arguments and return values are in degrees.

ecl2equ($lambda, $beta, $epsilon)

Conversion of ecliptic into equatorial coordinates

Arguments

• $lambda — celestial longitude

• $beta — celestial latitude

• $epsilon — ecliptic obliquity

Returns

Equatorial coordinates:

• $alpha — right ascension

• $delta — declination

All arguments and return values are in degrees.

equ2hor($h, $delta, $phi)

Conversion of equatorial into horizontal coordinates

Arguments

• $h — the local hour angle, in degrees, measured westwards from the South. h = Local Sidereal Time - Right Ascension

• $delta — declination, in arc-degrees

• $phi — the observer's latitude, in arc-degrees, positive in the nothern hemisphere, negative in the southern hemisphere.

Returns

Horizontal coordinates:

• azimuth, in degrees, measured westward from the South

• altitude, in degrees, positive above the horizon

hor2equ($az, $alt, $phi)

Convert horizontal to equatorial coordinates.

Arguments

• $az — azimuth, in degrees, measured westward from the South

• $alt — altitude, in degrees, positive above the horizon

• $phi — the observer's latitude, in arc-degrees, positive in the nothern hemisphere, negative in the southern hemisphere.

Returns

Horizontal coordinates:

• hour angle, in arc-degrees

• declination, in arc-degrees

SUPPORT

You can find documentation for this module with the perldoc command.

    perldoc Astro::Montenbruck::CoCo

AUTHOR

Sergey Krushinsky, <krushi at cpan.org>

COPYRIGHT AND LICENSE

Copyright (C) 2009-2019 by Sergey Krushinsky

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

cpanm Astro::Montenbruck

perl -MCPAN -e shell
install Astro::Montenbruck