* September 1998. This code is based upon algorithms and data kindly
* provided by Mr. Paul Schlyter. (pausch@saaf.se).
*
- * 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.
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
*
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * 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
- * General Public License for more details.
+ * Library 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
*
* $Id$
**************************************************************************/
/**************************************************************************
- * void CelestialBody::updatePosition(SGTime *t, Star *ourSun)
+ * void CelestialBody::updatePosition(double mjd, Star *ourSun)
*
* Basically, this member function provides a general interface for
* calculating the right ascension and declinaion. This function is
* position is calculated an a slightly different manner.
*
* arguments:
- * SGTime t: provides the current time.
+ * double mjd: provides the modified julian date.
* Star *ourSun: the sun's position is needed to convert heliocentric
* coordinates into geocentric coordinates.
*
* return value: none
*
*************************************************************************/
-void CelestialBody::updatePosition(SGTime *t, Star *ourSun)
+void CelestialBody::updatePosition(double mjd, Star *ourSun)
{
double eccAnom, v, ecl, actTime,
xv, yv, xh, yh, zh, xg, yg, zg, xe, ye, ze;
- updateOrbElements(t);
- actTime = fgCalcActTime(t);
+ updateOrbElements(mjd);
+ actTime = sgCalcActTime(mjd);
// calcualate the angle bewteen ecliptic and equatorial coordinate system
ecl = DEG_TO_RAD * (23.4393 - 3.563E-7 *actTime);
- eccAnom = fgCalcEccAnom(M, e); //calculate the eccentric anomaly
+ eccAnom = sgCalcEccAnom(M, e); //calculate the eccentric anomaly
xv = a * (cos(eccAnom) - e);
yv = a * (sqrt (1.0 - e*e) * sin(eccAnom));
v = atan2(yv, xv); // the planet's true anomaly
}
FV = RAD_TO_DEG * acos( tmp );
-};
+}
/****************************************************************************
- * double CelestialBody::fgCalcEccAnom(double M, double e)
+ * double CelestialBody::sgCalcEccAnom(double M, double e)
* this private member calculates the eccentric anomaly of a celestial body,
* given its mean anomaly and eccentricity.
*
* the eccentric anomaly
*
****************************************************************************/
-double CelestialBody::fgCalcEccAnom(double M, double e)
+double CelestialBody::sgCalcEccAnom(double M, double e)
{
double
eccAnom, E0, E1, diff;