💿🐜 Antkeeper source code
https://antkeeper.com
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51 lines
1.4 KiB
51 lines
1.4 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_UT1_HPP
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#define ANTKEEPER_PHYSICS_TIME_UT1_HPP
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#include "math/constants.hpp"
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namespace physics {
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namespace time {
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/// Functions which operate on UT1 universal time.
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namespace ut1 {
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/**
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* Calculates the Earth Rotation Angle (ERA) at a given UT1 date.
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*
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* @param t J2000 UT1 date.
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* @return ERA at the given date, in radians.
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*/
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template <class T>
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T era(T t);
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template <class T>
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T era(T t)
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{
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return math::two_pi<T> * (T(0.7790572732640) + T(1.00273781191135448) * t);
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}
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} // namespace ut1
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} // namespace time
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} // namespace physics
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#endif // ANTKEEPER_PHYSICS_TIME_UT1_HPP
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