Moved from .../Src/Scenery/ to .../Src/Astro/

2009-09-15 18:31:19 +02:00
parent 0363628a55
commit 7b3b55f6ef
16 changed files with 699 additions and 235 deletions
@@ -0,0 +1,93 @@
+/**************************************************************************
+ * orbits.h - calculates the orbital elements of the sun, moon and planets.
+ *            For inclusion in flight gear
+ *
+ * Written 1997 by Durk Talsma, started October 19, 1997.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id$
+ * (Log is kept at end of this file)
+ **************************************************************************/
+
+
+#ifndef ORBITS_H
+#define ORBITS_H
+
+
+#include <stdio.h>
+#include <math.h>
+
+#include "../Time/fg_time.h"
+
+
+
+#define STANDARDEPOCH 2000
+#define PIOVER180	1.74532925199433E-002
+
+struct SunPos {
+    double xs;
+    double ys;
+    double dist;
+};
+
+struct OrbElements {
+    double NFirst;		/* longitude of the ascending node first part */
+    double NSec;		/* longitude of the ascending node second part */
+    double iFirst;		/* inclination to the ecliptic first part */
+    double iSec;		/* inclination to the ecliptic second part */
+    double wFirst;		/* first part of argument of perihelion */
+    double wSec;		/* second part of argument of perihelion */
+    double aFirst;		/* semimayor axis first part*/
+    double aSec;		/* semimayor axis second part */
+    double eFirst;		/* eccentricity first part */
+    double eSec;		/* eccentricity second part */
+    double MFirst;		/* Mean anomaly first part */
+    double MSec;		/* Mean anomaly second part */
+
+    double N, i, w, a, e, M;	/* the resultant orbital elements, obtained from the former */
+};
+
+struct CelestialCoord {
+    double RightAscension;
+    double Declination;
+    double distance;
+    double magnitude;
+};
+
+
+double fgDegToRad(double angle);
+double fgCalcEccAnom(double M, double e);
+double fgCalcActTime(struct fgTIME t);
+
+void fgReadOrbElements(struct OrbElements *dest, FILE *src);
+void fgSolarSystemInit(struct fgTIME t);
+void fgSolarSystemUpdate(struct OrbElements *planets, struct fgTIME t);
+
+
+#endif /* ORBITS_H */
+
+
+/* $Log$
+/* Revision 1.1  1998/01/07 03:16:17  curt
+/* Moved from .../Src/Scenery/ to .../Src/Astro/
+/*
+ * Revision 1.2  1997/12/30 16:36:52  curt
+ * Merged in Durk's changes ...
+ *
+ * Revision 1.1  1997/10/25 03:16:10  curt
+ * Initial revision of code contributed by Durk Talsma.
+ *
+ */