86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
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/**************************************************************************
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* orbits.h - calculates the orbital elements of the sun, moon and planets.
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* For inclusion in flight gear
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*
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* Written 1997 by Durk Talsma, started October 19, 1997.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id$
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* (Log is kept at end of this file)
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**************************************************************************/
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#ifndef ORBITS_H
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#define ORBITS_H
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#include <stdio.h>
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#include <math.h>
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#include "../Time/fg_time.h"
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#define STANDARDEPOCH 2000
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#define PIOVER180 1.74532925199433E-002
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struct SunPos {
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double xs;
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double ys;
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};
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struct OrbElements {
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double NFirst; /* longitude of the ascending node first part */
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double NSec; /* longitude of the ascending node second part */
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double iFirst; /* inclination to the ecliptic first part */
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double iSec; /* inclination to the ecliptic second part */
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double wFirst; /* first part of argument of perihelion */
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double wSec; /* second part of argument of perihelion */
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double aFirst; /* semimayor axis first part*/
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double aSec; /* semimayor axis second part */
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double eFirst; /* eccentricity first part */
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double eSec; /* eccentricity second part */
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double MFirst; /* Mean anomaly first part */
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double MSec; /* Mean anomaly second part */
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double N, i, w, a, e, M; /* the resultant orbital elements, obtained from the former */
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};
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struct CelestialCoord {
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double RightAscension;
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double Declination;
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double distance;
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};
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double fgDegToRad(double angle);
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double fgCalcEccAnom(double M, double e);
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double fgCalcActTime(struct fgTIME t);
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void fgReadOrbElements(struct OrbElements *dest, FILE *src);
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void fgSolarSystemInit(struct fgTIME t);
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void fgSolarSystemUpdate(struct OrbElements *planets, struct fgTIME t);
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#endif /* ORBITS_H */
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/* $Log$
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/* Revision 1.1 1997/10/25 03:16:10 curt
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/* Initial revision of code contributed by Durk Talsma.
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/*
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*/
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