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