|
/*
|
|
* Copyright (C) 2020 Christopher J. Howard
|
|
*
|
|
* This file is part of Antkeeper source code.
|
|
*
|
|
* Antkeeper source code is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* Antkeeper source code is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef ANTKEEPER_CELESTIAL_TIME_HPP
|
|
#define ANTKEEPER_CELESTIAL_TIME_HPP
|
|
|
|
namespace ast
|
|
{
|
|
|
|
/**
|
|
* Calculates the Julian date from a universal time.
|
|
*
|
|
* @param year Gregorian year, with 1 BC as 0.
|
|
* @param month Gregorian month, on [1, 12].
|
|
* @param day Gregorian day, on [1, 31].
|
|
* @param hour Hour, on [0, 23].
|
|
* @param minute Minute, on [0, 59].
|
|
* @param second Second on [0, 60).
|
|
* @return Julian date with fractional day.
|
|
*/
|
|
double ut_to_jd(int year, int month, int day, int hour, int minute, double second);
|
|
|
|
/**
|
|
* Calculates the Greenwich mean sidereal time (GMST) from a Julian date.
|
|
*
|
|
* @param jd Julian date.
|
|
* @return GMST, in radians.
|
|
*/
|
|
double jd_to_gmst(double jd);
|
|
|
|
/**
|
|
* Calculates local mean sidereal time (LMST) from a Julian date.
|
|
*
|
|
* @param jd Julian date.
|
|
* @param longitude Longitude of the observer, in radians.
|
|
*/
|
|
double jd_to_lmst(double jd, double longitude);
|
|
|
|
/**
|
|
* Calculates local mean sidereal time (LMST) from Greenwich mean sidereal time (GMST).
|
|
*
|
|
* @param gmst Greenwich mean sidereal time, in radians.
|
|
* @param longitude Longitude of the observer, in radians.
|
|
* @return Local mean sidereal time, in radians.
|
|
*/
|
|
double gmst_to_lmst(double gmst, double longitude);
|
|
|
|
} // namespace ast
|
|
|
|
#endif // ANTKEEPER_CELESTIAL_TIME_HPP
|