💿🐜 Antkeeper source code
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77 lines
2.7 KiB
77 lines
2.7 KiB
/*
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* Copyright (C) 2021 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_PHYSICS_TIME_GREGORIAN_HPP
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#define ANTKEEPER_PHYSICS_TIME_GREGORIAN_HPP
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#include "physics/time/jd.hpp"
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namespace physics {
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namespace time {
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/// Gregorian calender time.
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namespace gregorian {
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/**
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* Calculates the JD time from a Gregorian date and time. Valid for all dates after November 23, −4713.
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*
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* @param year Astronomical year numbering. 1 BC is `0`, 2 BC is `-1`.
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* @param month Month number on `[1, 12]`.
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* @param day Day number on `[1, 31]`.
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* @param hour Hour number on `[0, 23]`.
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* @param minute Minute number on `[0, 59]`.
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* @param second Fractional second on `[0.0, 60.0)`.
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* @param utc UTC offset.
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*
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* @return JD time.
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*
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* @see L. E. Doggett, Ch. 12, "Calendars", p. 606, in Seidelmann 1992
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*/
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template <class T>
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T to_jd(int year, int month, int day, int hour, int minute, T second, T utc)
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{
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T jdn = static_cast<T>((1461 * (year + 4800 + (month - 14) / 12)) / 4 + (367 * (month - 2 - 12 * ((month - 14) / 12))) / 12 - (3 * ((year + 4900 + (month - 14) / 12) / 100)) / 4 + day - 32075);
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return jdn + static_cast<T>(hour - 12) / T(24) + static_cast<T>(minute) / T(1440) + static_cast<T>(second) / T(86400) + utc / T(24);
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}
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/**
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* Calculates the UT1 time from a Gregorian date and time. Valid for all dates after November 23, −4713.
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*
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* @param year Astronomical year numbering. 1 BC is `0`, 2 BC is `-1`.
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* @param month Month number on `[1, 12]`.
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* @param day Day number on `[1, 31]`.
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* @param hour Hour number on `[0, 23]`.
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* @param minute Minute number on `[0, 59]`.
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* @param second Fractional second on `[0.0, 60.0)`.
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* @param utc UTC offset.
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*
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* @return UT1 time.
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*/
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template <class T>
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T to_ut1(int year, int month, int day, int hour, int minute, T second, T utc)
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{
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return physics::time::jd::to_ut1<T>(to_jd<T>(year, month, day, hour, minute, second, utc));
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}
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} // namespace gregorian
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} // namespace time
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} // namespace physics
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#endif // ANTKEEPER_PHYSICS_TIME_GREGORIAN_HPP
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