1 /**************************************************************************
2 * orbits.h - calculates the orbital elements of the sun, moon and planets.
3 * For inclusion in flight gear
5 * Written 1997 by Durk Talsma, started October 19, 1997.
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of the
10 * License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 * (Log is kept at end of this file)
23 **************************************************************************/
33 #include <Time/fg_time.h>
37 //#define STANDARDEPOCH 2000
46 extern fgSUNPOS solarPosition;
50 double NFirst; /* longitude of the ascending node first part */
51 double NSec; /* longitude of the ascending node second part */
52 double iFirst; /* inclination to the ecliptic first part */
53 double iSec; /* inclination to the ecliptic second part */
54 double wFirst; /* first part of argument of perihelion */
55 double wSec; /* second part of argument of perihelion */
56 double aFirst; /* semimayor axis first part*/
57 double aSec; /* semimayor axis second part */
58 double eFirst; /* eccentricity first part */
59 double eSec; /* eccentricity second part */
60 double MFirst; /* Mean anomaly first part */
61 double MSec; /* Mean anomaly second part */
63 double N, i, w, a, e, M; /* the resultant orbital elements, obtained from the former */
66 struct CelestialCoord {
67 double RightAscension;
74 double fgCalcEccAnom(double M, double e);
75 double fgCalcActTime(struct fgTIME t);
77 int fgReadOrbElements (struct OrbElements *dest, FILE * src);
78 int fgSolarSystemInit(struct fgTIME t);
79 void fgSolarSystemUpdate(struct OrbElements *planets, struct fgTIME t);
82 #endif /* _ORBITS_H */
86 /* Revision 1.6 1998/02/23 19:07:55 curt
87 /* Incorporated Durk's Astro/ tweaks. Includes unifying the sun position
88 /* calculation code between sun display, and other FG sections that use this
89 /* for things like lighting.
91 * Revision 1.5 1998/02/12 21:59:35 curt
92 * Incorporated code changes contributed by Charlie Hotchkiss
93 * <chotchkiss@namg.us.anritsu.com>
95 * Revision 1.4 1998/02/02 20:53:22 curt
98 * Revision 1.3 1998/01/22 02:59:27 curt
99 * Changed #ifdef FILE_H to #ifdef _FILE_H
101 * Revision 1.2 1998/01/19 19:26:58 curt
102 * Merged in make system changes from Bob Kuehne <rpk@sgi.com>
103 * This should simplify things tremendously.
105 * Revision 1.1 1998/01/07 03:16:17 curt
106 * Moved from .../Src/Scenery/ to .../Src/Astro/
108 * Revision 1.2 1997/12/30 16:36:52 curt
109 * Merged in Durk's changes ...
111 * Revision 1.1 1997/10/25 03:16:10 curt
112 * Initial revision of code contributed by Durk Talsma.