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/***************************************************************************
kssun.h - K Desktop Planetarium
-------------------
begin : Sun Jan 29 2002
copyright : (C) 2002 by Mark Hollomon
email : mhh@mindspring.com
***************************************************************************/
/***************************************************************************
* *
* This program 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 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef KSSUN_H
#define KSSUN_H
#include <tqstring.h>
#include "ksplanet.h"
/**@class KSSun
*Child class of KSPlanetBase; encapsulates information about the Sun.
*@short Provides necessary information about the Sun.
*@author Mark Hollomon
*@version 1.0
*/
class KStarsData;
class KSSun : public KSPlanet {
public:
/**Constructor. Defines constants needed by findPosition().
*Sets Ecliptic coordinates appropriate for J2000.
*@param kd pointer to KStarsData object
*@param fn filename of Sun image
*@param pSize physical diameter of the Sun, in km
*/
KSSun(KStarsData *kd, TQString fn = "", double pSize=0 );
/**Destructor (empty)
*/
virtual ~KSSun() {}
/**Read orbital data from disk
*@note reimplemented from KSPlanet
*@note we actually read Earth's orbital data. The Sun's geocentric
*ecliptic coordinates are by definition exactly the opposite of the
*Earth's heliocentric ecliptic coordinates.
*/
virtual bool loadData();
long double springEquinox(int year);
long double summerSolstice(int year);
long double autumnEquinox(int year);
long double winterSolstice(int year);
long double equinox(int year, int d, int m, double angle);
protected:
/**Determine geocentric RA, Dec coordinates for the Epoch given in the argument.
*@p Epoch current Julian Date
*@p Earth pointer to earth object
*/
virtual bool findGeocentricPosition( const KSNumbers *num, const KSPlanetBase *Earth=NULL );
};
long double equinox(int year, int d, int m, int angle);
#endif
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