|
/*
|
|
* 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_MECHANICS_HPP
|
|
#define ANTKEEPER_CELESTIAL_MECHANICS_HPP
|
|
|
|
#include "utility/fundamental-types.hpp"
|
|
|
|
namespace ast
|
|
{
|
|
|
|
/**
|
|
* Approximates the obliquity of the ecliptic.
|
|
*
|
|
* @param jd Julian date.
|
|
* @return Obliquity of the ecliptic, in radians.
|
|
*/
|
|
double approx_ecliptic_obliquity(double jd);
|
|
|
|
/**
|
|
* Approximates the ecliptic coordinates of the Earth's sun.
|
|
*
|
|
* @param jd Julian date.
|
|
* @return Ecliptic rectangular geocentric coordinates of the Earth's sun, with distance in AU.
|
|
*/
|
|
double3 approx_sun_ecliptic(double jd);
|
|
|
|
/**
|
|
* Approximates the ecliptic coordinates of the Earth's moon.
|
|
*
|
|
* @param jd Julian date.
|
|
* @return Ecliptic rectangular geocentric coordinates of the Earth's moon, with distance in Earth radii.
|
|
*/
|
|
double3 approx_moon_ecliptic(double jd);
|
|
|
|
/**
|
|
* Approximates the ecliptic rotation of the Earth's moon.
|
|
*
|
|
* @param jd Julian date.
|
|
* @return Rotation matrix representing the moon's rotation in ecliptic space.
|
|
*/
|
|
double3x3 approx_moon_ecliptic_rotation(double jd);
|
|
|
|
struct kepler_orbit
|
|
{
|
|
double a; ///< Semi-major axis, a
|
|
double ec; ///< Eccentricity, e
|
|
double w; ///< Argument of periapsis, w (radians)
|
|
double ma; ///< Mean anomaly, M (radians)
|
|
double i; ///< Inclination, i (radians)
|
|
double om; ///< Longitude of the ascending node, OMEGA (radians)
|
|
};
|
|
|
|
double3 solve_kepler(const kepler_orbit& orbit, double t);
|
|
|
|
double3 solve_kepler(double a, double ec, double w, double ma, double i, double om);
|
|
|
|
} // namespace ast
|
|
|
|
#endif // ANTKEEPER_CELESTIAL_MECHANICS_HPP
|