NAME
Astro::Montenbruck::CoCo - Coordinates conversions.
VERSION
Version 0.01
DESCRIPTION
Celestial sphera related calculations used by AstroScript modules.
EXPORT
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::CoCoAUTHOR
Sergey Krushinsky, <krushi at cpan.org>
COPYRIGHT AND LICENSE
Copyright (C) 2009-2020 by Sergey Krushinsky
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.