/*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright (C) 2000 - 2005 Liam Girdwood
*/
#ifndef _LN_EARTH_H
#define _LN_EARTH_H
#include <libnova/ln_types.h>
#ifdef __cplusplus
extern "C" {
#endif
/*! \defgroup earth Earth
*
* Functions relating to the planet Earth.
*
* All angles are expressed in degrees.
*/
/*
** Earth
*/
/*! \fn void ln_get_earth_helio_coords (double JD, struct ln_helio_posn * position);
* \brief Calculate Earth's heliocentric coordinates
* \ingroup earth
*/
/* Chapter 31 Pg 206-207 Equ 31.1 31.2 , 31.3 using VSOP 87 */
void LIBNOVA_EXPORT ln_get_earth_helio_coords (double JD, struct ln_helio_posn * position);
/*! \fn void ln_get_earth_solar_dist (double JD);
* \brief Calculate the distance between Earth and the Sun.
* \ingroup earth
* \return Distance in AU
*/
/* Chapter ?? */
double LIBNOVA_EXPORT ln_get_earth_solar_dist (double JD);
/*! \fn void ln_get_earth_rect_helio (double JD, struct ln_rect_posn * position)
* \ingroup earth
* \brief Calculate the Earths rectangular heliocentric coordinates.
*/
void LIBNOVA_EXPORT ln_get_earth_rect_helio (double JD, struct ln_rect_posn * position);
/*! \fn void ln_get_earth_centre_dist (float height, double latitude, double * p_sin_o, double * p_cos_o);
* \ingroup earth
* \brief Calculate Earth globe centre distance.
*/
void LIBNOVA_EXPORT ln_get_earth_centre_dist (float height, double latitude, double * p_sin_o, double * p_cos_o);
#ifdef __cplusplus
};
#endif
#endif