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
38 #define PIOVER180 1.74532925199433E-002
47 double NFirst; /* longitude of the ascending node first part */
48 double NSec; /* longitude of the ascending node second part */
49 double iFirst; /* inclination to the ecliptic first part */
50 double iSec; /* inclination to the ecliptic second part */
51 double wFirst; /* first part of argument of perihelion */
52 double wSec; /* second part of argument of perihelion */
53 double aFirst; /* semimayor axis first part*/
54 double aSec; /* semimayor axis second part */
55 double eFirst; /* eccentricity first part */
56 double eSec; /* eccentricity second part */
57 double MFirst; /* Mean anomaly first part */
58 double MSec; /* Mean anomaly second part */
60 double N, i, w, a, e, M; /* the resultant orbital elements, obtained from the former */
63 struct CelestialCoord {
64 double RightAscension;
71 /* double fgDegToRad(double angle); */
72 double fgCalcEccAnom(double M, double e);
73 double fgCalcActTime(struct fgTIME t);
75 void fgReadOrbElements(struct OrbElements *dest, FILE *src);
76 int fgSolarSystemInit(struct fgTIME t);
77 void fgSolarSystemUpdate(struct OrbElements *planets, struct fgTIME t);
80 #endif /* _ORBITS_H */
84 /* Revision 1.5 1998/02/12 21:59:35 curt
85 /* Incorporated code changes contributed by Charlie Hotchkiss
86 /* <chotchkiss@namg.us.anritsu.com>
88 * Revision 1.4 1998/02/02 20:53:22 curt
91 * Revision 1.3 1998/01/22 02:59:27 curt
92 * Changed #ifdef FILE_H to #ifdef _FILE_H
94 * Revision 1.2 1998/01/19 19:26:58 curt
95 * Merged in make system changes from Bob Kuehne <rpk@sgi.com>
96 * This should simplify things tremendously.
98 * Revision 1.1 1998/01/07 03:16:17 curt
99 * Moved from .../Src/Scenery/ to .../Src/Astro/
101 * Revision 1.2 1997/12/30 16:36:52 curt
102 * Merged in Durk's changes ...
104 * Revision 1.1 1997/10/25 03:16:10 curt
105 * Initial revision of code contributed by Durk Talsma.