Exposure of the moon position.

The following functions have been added:  MoonPos::getM(), MoonPos::getw(),
MoonPos::getxg(), MoonPos::getyg(), MoonPos::getye(), MoonPos::getze(),
MoonPos::getDistance().  These are copied from and match the Star class
functions (but with xs and ys replaced by xg and yg).

simgear/ephemeris/moonpos.cxx

@@ -78,7 +78,7 @@ void MoonPos::updatePosition(double mjd, double lst, double lat, Star *ourSun)
 {
   double 
     eccAnom, ecl, actTime,
-    xv, yv, v, r, xh, yh, zh, xg, yg, zg, xe, ye, ze,
+    xv, yv, v, r, xh, yh, zh, zg, xe,
     Ls, Lm, D, F, mpar, gclat, rho, HA, g,
     geoRa, geoDec,
     cosN, sinN, cosvw, sinvw, sinvw_cosi, cosecl, sinecl, rcoslatEcl,
@@ -149,6 +149,7 @@ void MoonPos::updatePosition(double mjd, double lst, double lat, Star *ourSun)
   r += (-0.58 * cos(MlesstwoD)
 	-0.46 * cos(twoD)
 	);
+  distance = r;
   // SG_LOG(SG_GENERAL, SG_INFO, "Running moon update");
   rcoslatEcl = r * cos(latEcl);
   xg =     cos(lonEcl) * rcoslatEcl;

simgear/ephemeris/moonpos.hxx

@@ -36,6 +36,9 @@ class MoonPos : public CelestialBody
 
 private:
 
+    double xg, yg;     // the moon's rectangular geocentric coordinates
+    double ye, ze;     // the moon's rectangular equatorial coordinates
+    double distance;   // the moon's distance to the earth
     // void TexInit();  // This should move to the constructor eventually.
 
     // GLUquadricObj *moonObject;
@@ -54,7 +57,48 @@ public:
     ~MoonPos();
     void updatePosition(double mjd, double lst, double lat, Star *ourSun);
     // void newImage();
+    double getM() const;
+    double getw() const;
+    double getxg() const;
+    double getyg() const;
+    double getye() const;
+    double getze() const;
+    double getDistance() const;
 };
 
+inline double MoonPos::getM() const
+{
+  return M;
+}
+
+inline double MoonPos::getw() const
+{
+  return w;
+}
+
+inline double MoonPos::getxg() const
+{
+  return xg;
+}
+
+inline double MoonPos::getyg() const
+{
+  return yg;
+}
+
+inline double MoonPos::getye() const
+{
+   return ye;
+}
+
+inline double MoonPos::getze() const
+{
+   return ze;
+}
+
+inline double MoonPos::getDistance() const
+{
+  return distance;
+}
 
 #endif // _MOONPOS_HXX_