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 **************************************************************************/
31 # error This library requires C++
38 #include <Time/fg_time.hxx>
42 //#define STANDARDEPOCH 2000
51 extern fgSUNPOS solarPosition;
55 double NFirst; /* longitude of the ascending node first part */
56 double NSec; /* longitude of the ascending node second part */
57 double iFirst; /* inclination to the ecliptic first part */
58 double iSec; /* inclination to the ecliptic second part */
59 double wFirst; /* first part of argument of perihelion */
60 double wSec; /* second part of argument of perihelion */
61 double aFirst; /* semimayor axis first part*/
62 double aSec; /* semimayor axis second part */
63 double eFirst; /* eccentricity first part */
64 double eSec; /* eccentricity second part */
65 double MFirst; /* Mean anomaly first part */
66 double MSec; /* Mean anomaly second part */
68 double N, i, w, a, e, M; /* the resultant orbital elements, obtained from the former */
71 struct CelestialCoord {
72 double RightAscension;
79 double fgCalcEccAnom(double M, double e);
80 double fgCalcActTime(fgTIME t);
82 int fgReadOrbElements (struct OrbElements *dest, FILE * src);
83 int fgSolarSystemInit(fgTIME t);
84 void fgSolarSystemUpdate(struct OrbElements *planets, fgTIME t);
87 #endif /* _ORBITS_HXX */
91 /* Revision 1.3 1998/04/28 01:19:01 curt
92 /* Type-ified fgTIME and fgVIEW
94 * Revision 1.2 1998/04/24 00:45:01 curt
95 * Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
96 * Fixed a bug when generating sky colors.
98 * Revision 1.1 1998/04/22 13:21:30 curt
99 * C++ - ifing the code a bit.
101 * Revision 1.7 1998/04/21 17:02:31 curt
102 * Prepairing for C++ integration.
104 * Revision 1.6 1998/02/23 19:07:55 curt
105 * Incorporated Durk's Astro/ tweaks. Includes unifying the sun position
106 * calculation code between sun display, and other FG sections that use this
107 * for things like lighting.
109 * Revision 1.5 1998/02/12 21:59:35 curt
110 * Incorporated code changes contributed by Charlie Hotchkiss
111 * <chotchkiss@namg.us.anritsu.com>
113 * Revision 1.4 1998/02/02 20:53:22 curt
116 * Revision 1.3 1998/01/22 02:59:27 curt
117 * Changed #ifdef FILE_H to #ifdef _FILE_H
119 * Revision 1.2 1998/01/19 19:26:58 curt
120 * Merged in make system changes from Bob Kuehne <rpk@sgi.com>
121 * This should simplify things tremendously.
123 * Revision 1.1 1998/01/07 03:16:17 curt
124 * Moved from .../Src/Scenery/ to .../Src/Astro/
126 * Revision 1.2 1997/12/30 16:36:52 curt
127 * Merged in Durk's changes ...
129 * Revision 1.1 1997/10/25 03:16:10 curt
130 * Initial revision of code contributed by Durk Talsma.