/*
 *  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  
 */

#include <libnova/apparent_position.h>
#include <libnova/proper_motion.h>
#include <libnova/aberration.h>
#include <libnova/precession.h>

/*
** Apparent place of an Object 
*/

/*! \fn void ln_get_apparent_posn (struct ln_equ_posn * mean_position, struct ln_equ_posn * proper_motion, double JD, struct ln_equ_posn * position)
* \param mean_position Mean position of object
* \param proper_motion Proper motion of object
* \param JD Julian Day
* \param position Pointer to store new object position
*
* Calculate the apparent equatorial position of a star from its mean equatorial position. 
* This function takes into account the effects of proper motion, precession, nutation, 
* annual aberration when calculating the stars apparent position. The effects of annual 
* parallax and the gravitational deflection of light (Einstein effect) are NOT used
* in this calculation. 
*/
void ln_get_apparent_posn (struct ln_equ_posn * mean_position, struct ln_equ_posn * proper_motion, double JD,struct ln_equ_posn * position)
{
	struct ln_equ_posn proper_position;
	struct ln_equ_posn aberration_position;
	
	ln_get_equ_pm (mean_position, proper_motion, JD, &proper_position);
	ln_get_equ_aber (&proper_position, JD, &aberration_position);
	ln_get_equ_prec (&aberration_position, JD, position);
}