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/*
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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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