#include "orbits.h"
#include "moon.h"
+#include "../Aircraft/aircraft.h"
+#include "../Include/constants.h"
#include "../Include/general.h"
#include "../Main/views.h"
#include "../Time/fg_time.h"
struct OrbElements sunParams,
struct fgTIME t)
{
- struct CelestialCoord
- result;
-
- double
- eccAnom, ecl, lonecl, latecl, actTime,
- xv, yv, v, r, xh, yh, zh, xg, yg, zg, xe, ye, ze,
- Ls, Lm, D, F;
-
- /* calculate the angle between ecliptic and equatorial coordinate system */
- actTime = fgCalcActTime(t);
- ecl = fgDegToRad(23.4393 - 3.563E-7 * actTime); // in radians of course
-
- /* calculate the eccentric anomaly */
- eccAnom = fgCalcEccAnom(params.M, params.e);
-
- /* calculate the moon's distance (d) and true anomaly (v) */
- xv = params.a * ( cos(eccAnom) - params.e);
- yv = params.a * ( sqrt(1.0 - params.e*params.e) * sin(eccAnom));
- v =atan2(yv, xv);
- r = sqrt(xv*xv + yv*yv);
-
- /* estimate the geocentric rectangular coordinates here */
- xh = r * (cos(params.N) * cos(v + params.w) - sin(params.N) * sin(v + params.w) * cos(params.i));
- yh = r * (sin(params.N) * cos(v + params.w) + cos(params.N) * sin(v + params.w) * cos(params.i));
- zh = r * (sin(v + params.w) * sin(params.i));
-
- /* calculate the ecliptic latitude and longitude here */
- lonecl = atan2( yh, xh);
- latecl = atan2( zh, sqrt( xh*xh + yh*yh));
-
- /* calculate a number of perturbations */
- Ls = sunParams.M + sunParams.w;
- Lm = params.M + params.w + params.N;
- D = Lm - Ls;
- F = Lm - params.N;
-
- lonecl += fgDegToRad(
- - 1.274 * sin (params.M - 2*D) // the Evection
- + 0.658 * sin (2 * D) // the Variation
- - 0.186 * sin (sunParams.M) // the yearly variation
- - 0.059 * sin (2*params.M - 2*D)
- - 0.057 * sin (params.M - 2*D + sunParams.M)
- + 0.053 * sin (params.M + 2*D)
- + 0.046 * sin (2*D - sunParams.M)
- + 0.041 * sin (params.M - sunParams.M)
- - 0.035 * sin (D) // the Parallactic Equation
- - 0.031 * sin (params.M + sunParams.M)
- - 0.015 * sin (2*F - 2*D)
- + 0.011 * sin (params.M - 4*D)
- ); /* Pheeuuwwww */
- latecl += fgDegToRad(
- - 0.173 * sin (F - 2*D)
- - 0.055 * sin (params.M - F - 2*D)
- - 0.046 * sin (params.M + F - 2*D)
- + 0.033 * sin (F + 2*D)
- + 0.017 * sin (2 * params.M + F)
- ); /* Yep */
-
- r += (
- - 0.58 * cos(params.M - 2*D)
- - 0.46 * cos(2*D)
- ); /* Ok! */
-
- xg = r * cos(lonecl) * cos(latecl);
- yg = r * sin(lonecl) * cos(latecl);
- zg = r * sin(latecl);
-
- xe = xg;
- ye = yg * cos(ecl) - zg * sin(ecl);
- ze = yg * sin(ecl) + zg * cos(ecl);
-
- result.RightAscension = atan2(ye, xe);
- result.Declination = atan2(ze, sqrt(xe*xe + ye*ye));
- return result;
+ struct CelestialCoord
+ geocCoord, topocCoord;
+
+
+ double
+ eccAnom, ecl, lonecl, latecl, actTime,
+ xv, yv, v, r, xh, yh, zh, xg, yg, zg, xe, ye, ze,
+ Ls, Lm, D, F, mpar, gclat, rho, HA, g;
+
+ struct fgAIRCRAFT *a;
+ struct fgFLIGHT *f;
+
+ a = ¤t_aircraft;
+ f = &a->flight;
+
+/* calculate the angle between ecliptic and equatorial coordinate system */
+ actTime = fgCalcActTime(t);
+ ecl = fgDegToRad(23.4393 - 3.563E-7 * actTime); // in radians of course
+
+ /* calculate the eccentric anomaly */
+ eccAnom = fgCalcEccAnom(params.M, params.e);
+
+ /* calculate the moon's distance (d) and true anomaly (v) */
+ xv = params.a * ( cos(eccAnom) - params.e);
+ yv = params.a * ( sqrt(1.0 - params.e*params.e) * sin(eccAnom));
+ v =atan2(yv, xv);
+ r = sqrt(xv*xv + yv*yv);
+
+ /* estimate the geocentric rectangular coordinates here */
+ xh = r * (cos(params.N) * cos(v + params.w) - sin(params.N) * sin(v + params.w) * cos(params.i));
+ yh = r * (sin(params.N) * cos(v + params.w) + cos(params.N) * sin(v + params.w) * cos(params.i));
+ zh = r * (sin(v + params.w) * sin(params.i));
+
+ /* calculate the ecliptic latitude and longitude here */
+ lonecl = atan2( yh, xh);
+ latecl = atan2( zh, sqrt( xh*xh + yh*yh));
+
+ /* calculate a number of perturbations */
+ Ls = sunParams.M + sunParams.w;
+ Lm = params.M + params.w + params.N;
+ D = Lm - Ls;
+ F = Lm - params.N;
+
+ lonecl += fgDegToRad(
+ - 1.274 * sin (params.M - 2*D) // the Evection
+ + 0.658 * sin (2 * D) // the Variation
+ - 0.186 * sin (sunParams.M) // the yearly variation
+ - 0.059 * sin (2*params.M - 2*D)
+ - 0.057 * sin (params.M - 2*D + sunParams.M)
+ + 0.053 * sin (params.M + 2*D)
+ + 0.046 * sin (2*D - sunParams.M)
+ + 0.041 * sin (params.M - sunParams.M)
+ - 0.035 * sin (D) // the Parallactic Equation
+ - 0.031 * sin (params.M + sunParams.M)
+ - 0.015 * sin (2*F - 2*D)
+ + 0.011 * sin (params.M - 4*D)
+ ); /* Pheeuuwwww */
+ latecl += fgDegToRad(
+ - 0.173 * sin (F - 2*D)
+ - 0.055 * sin (params.M - F - 2*D)
+ - 0.046 * sin (params.M + F - 2*D)
+ + 0.033 * sin (F + 2*D)
+ + 0.017 * sin (2 * params.M + F)
+ ); /* Yep */
+
+ r += (
+ - 0.58 * cos(params.M - 2*D)
+ - 0.46 * cos(2*D)
+ ); /* Ok! */
+
+ xg = r * cos(lonecl) * cos(latecl);
+ yg = r * sin(lonecl) * cos(latecl);
+ zg = r * sin(latecl);
+
+ xe = xg;
+ ye = yg * cos(ecl) - zg * sin(ecl);
+ ze = yg * sin(ecl) + zg * cos(ecl);
+
+
+
+
+ geocCoord.RightAscension = atan2(ye, xe);
+ geocCoord.Declination = atan2(ze, sqrt(xe*xe + ye*ye));
+
+ /* New since 25 december 1997 */
+ /* Calculate the moon's topocentric position instead of it's geocentric! */
+
+ mpar = asin( 1 / r); /* calculate the moon's parrallax, i.e. the apparent size of the
+ (equatorial) radius of the Earth, as seen from the moon */
+ gclat = FG_Latitude - 0.083358 * sin (2 * fgDegToRad( FG_Latitude));
+ rho = 0.99883 + 0.00167 * cos(2 * fgDegToRad(FG_Latitude));
+
+ if (geocCoord.RightAscension < 0)
+ geocCoord.RightAscension += (2*FG_PI);
+
+ HA = t.lst - (3.8197186 * geocCoord.RightAscension);
+
+ g = atan (tan(gclat) / cos( (HA / 3.8197186)));
+
+
+
+ topocCoord.RightAscension = geocCoord.RightAscension - mpar * rho * cos(gclat) * sin(HA) / cos(geocCoord.Declination);
+ topocCoord.Declination = geocCoord.Declination - mpar * rho * sin(gclat) * sin(g - geocCoord.Declination) / sin(g);
+ return topocCoord;
}
struct fgLIGHT *l;
static int dl_exists = 0;
+ printf("Initializing the Moon\n");
+
l = &cur_light_params;
/* position the moon */
moonPos.Declination);
#endif
+ xMoon = 60000.0 * cos(moonPos.RightAscension) * cos(moonPos.Declination);
+ yMoon = 60000.0 * sin(moonPos.RightAscension) * cos(moonPos.Declination);
+ zMoon = 60000.0 * sin(moonPos.Declination);
+
if ( !dl_exists ) {
dl_exists = 1;
xglMaterialfv(GL_FRONT, GL_DIFFUSE, moon_color); */
- xMoon = 60000.0 * cos(moonPos.RightAscension) *
- cos(moonPos.Declination);
- yMoon = 60000.0 * sin(moonPos.RightAscension) *
- cos(moonPos.Declination);
- zMoon = 60000.0 * sin(moonPos.Declination);
-
glutSolidSphere(1.0, 10, 10);
xglEndList();
struct fgLIGHT *l;
GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
+ /* printf("Rendering moon\n"); */
+
l = &cur_light_params;
xglMaterialfv(GL_FRONT, GL_AMBIENT, l->sky_color );
xglPopMatrix();
}
+
+/* $Log$
+/* Revision 1.16 1998/01/06 01:20:24 curt
+/* Tweaks to help building with MSVC++
+/*
+ * Revision 1.15 1998/01/05 18:44:35 curt
+ * Add an option to advance/decrease time from keyboard.
+ *
+ * Revision 1.14 1997/12/30 20:47:50 curt
+ * Integrated new event manager with subsystem initializations.
+ *
+ * Revision 1.13 1997/12/30 16:41:00 curt
+ * Added log at end of file.
+ *
+ */
projects / simgear.git / blobdiff