e798c59696
calculation code between sun display, and other FG sections that use this for things like lighting.
114 lines
3.4 KiB
C
114 lines
3.4 KiB
C
/**************************************************************************
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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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typedef struct {
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double xs;
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double ys;
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double dist;
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double lonSun;
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} fgSUNPOS;
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extern fgSUNPOS solarPosition;
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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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double magnitude;
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};
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double fgCalcEccAnom(double M, double e);
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double fgCalcActTime(struct fgTIME t);
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int fgReadOrbElements (struct OrbElements *dest, FILE * src);
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int 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 1.6 1998/02/23 19:07:55 curt
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/* Incorporated Durk's Astro/ tweaks. Includes unifying the sun position
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/* calculation code between sun display, and other FG sections that use this
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/* for things like lighting.
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/*
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* Revision 1.5 1998/02/12 21:59:35 curt
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* Incorporated code changes contributed by Charlie Hotchkiss
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* <chotchkiss@namg.us.anritsu.com>
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*
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* Revision 1.4 1998/02/02 20:53:22 curt
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* To version 0.29
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*
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* Revision 1.3 1998/01/22 02:59:27 curt
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* Changed #ifdef FILE_H to #ifdef _FILE_H
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*
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* Revision 1.2 1998/01/19 19:26:58 curt
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* Merged in make system changes from Bob Kuehne <rpk@sgi.com>
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* This should simplify things tremendously.
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*
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* Revision 1.1 1998/01/07 03:16:17 curt
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* Moved from .../Src/Scenery/ to .../Src/Astro/
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*
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* Revision 1.2 1997/12/30 16:36:52 curt
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* Merged in Durk's changes ...
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*
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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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