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