text: /*
   *  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_MARS_H
  #define _LN_MARS_H
  
  #include <libnova/ln_types.h>
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /*! \defgroup mars Mars
  *
  * Functions relating to the planet Mars.
  *
  * All angles are expressed in degrees.
  */
  
  /*! \fn double ln_get_mars_sdiam(double JD)
  * \brief Calculate the semidiameter of Mars in arc seconds.
  * \ingroup mars
  */
  double LIBNOVA_EXPORT ln_get_mars_sdiam(double JD);
  	
  /*! \fn double ln_get_mars_rst(double JD, struct ln_lnlat_posn *observer, struct ln_rst_time *rst);
  * \brief Calculate the time of rise, set and transit for Mars.
  * \ingroup mars
  */
  int LIBNOVA_EXPORT ln_get_mars_rst(double JD, struct ln_lnlat_posn *observer,
  	struct ln_rst_time *rst);
  	
  /*! \fn void ln_get_mars_helio_coords(double JD, struct ln_helio_posn *position);
  * \brief Calculate Mars heliocentric coordinates
  * \ingroup mars
  */ 
  /* Chapter 31 Pg 206-207 Equ 31.1 31.2 , 31.3 using VSOP 87 */
  void LIBNOVA_EXPORT ln_get_mars_helio_coords(double JD,
  	struct ln_helio_posn *position);
  
  /*! \fn void ln_get_mars_equ_coords(double JD, struct ln_equ_posn *position);
  * \brief Calculate Mars equatorial coordinates
  * \ingroup mars
  */ 
  /* Chapter 31 Pg 206-207 Equ 31.1 31.2 , 31.3 using VSOP 87 */
  void LIBNOVA_EXPORT ln_get_mars_equ_coords(double JD,
  	struct ln_equ_posn *position);
  
  /*! \fn double ln_get_mars_earth_dist(double JD);
  * \brief Calculate the distance between Mars and the Earth.
  * \ingroup mars
  * \return Distance in AU
  */ 
  /* Chapter ?? */
  double LIBNOVA_EXPORT ln_get_mars_earth_dist(double JD);
  	
  /*! \fn double ln_get_mars_solar_dist(double JD);
  * \brief Calculate the distance between Mars and the Sun.
  * \ingroup mars
  * \return Distance in AU
  */ 
  /* Chapter ?? */
  double LIBNOVA_EXPORT ln_get_mars_solar_dist(double JD);
  	
  /*! \fn double ln_get_mars_magnitude(double JD);
  * \brief Calculate the visible magnitude of Mars
  * \ingroup mars
  * \return Visible magnitude of Mars
  */ 
  /* Chapter ?? */
  double LIBNOVA_EXPORT ln_get_mars_magnitude(double JD);
  
  /*! \fn double ln_get_mars_disk(double JD);
  * \brief Calculate the illuminated fraction of Mars disk
  * \ingroup mars
  * \return Illuminated fraction of Mars disk
  */ 
  /* Chapter 41 */
  double LIBNOVA_EXPORT ln_get_mars_disk(double JD);
  
  /*! \fn double ln_get_mars_phase(double JD);
  * \brief Calculate the phase angle of Mars.
  * \ingroup mars
  * \return Phase angle of Mars (degrees)
  */ 
  /* Chapter 41 */
  double LIBNOVA_EXPORT ln_get_mars_phase(double JD);
  
  /*! \fn void ln_get_mars_rect_helio(double JD, struct ln_rect_posn *position)
  * \ingroup mars
  * \brief Calculate Mars rectangular heliocentric coordinates.
  */
  void LIBNOVA_EXPORT ln_get_mars_rect_helio(double JD,
  	struct ln_rect_posn *position);
  	
  #ifdef __cplusplus
  };
  #endif
  
  #endif
  