💿🐜 Antkeeper source code
https://antkeeper.com
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62 lines
1.7 KiB
62 lines
1.7 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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#include "celestial-time.hpp"
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#include "math/angles.hpp"
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#include <cmath>
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namespace ast
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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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if (month < 3)
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{
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month += 12;
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year -= 1;
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}
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const signed long Y = year;
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const signed long M = month;
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const signed long D = day;
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const signed long JDN = (1461*(Y+4800+(M-14)/12))/4+(367*(M-2-12*((M-14)/12)))/12-(3*((Y+4900+(M-14)/12)/100))/4+D-32075;
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const double h = static_cast<double>(hour - 12) / 24.0;
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const double m = static_cast<double>(minute) / 1440.0;
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const double s = second / 86400.0;
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return static_cast<double>(JDN) + h + m + s;
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}
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double jd_to_gmst(double jd)
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{
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return math::wrap_radians<double>(4.894961212 + 6.300388098 * (jd - 2451545.0));
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}
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double jd_to_lmst(double jd, double longitude)
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{
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return gmst_to_lmst(jd_to_gmst(jd), longitude);
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}
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double gmst_to_lmst(double gmst, double longitude)
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{
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return gmst + longitude;
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}
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} // namespace ast
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