fix the function name to barycentric for Sun special

Author: henrysky

src/core/modules/SolarSystem.cpp

@@ -1190,7 +1190,7 @@ bool SolarSystem::loadPlanets(const QString& filePath)
 		else
 		{
 			static const QMap<QString, posFuncType>posfuncMap={
-				{ "sun_special",       &get_sun_helio_coordsv},
+				{ "sun_special",       &get_sun_barycentric_coordsv},
 				{ "mercury_special",   &get_mercury_helio_coordsv},
 				{ "venus_special",     &get_venus_helio_coordsv},
 				{ "earth_special",     &get_earth_helio_coordsv},

src/core/planetsephems/EphemWrapper.cpp

@@ -287,8 +287,15 @@ void get_pluto_helio_coordsv(double jd,double xyz[3], double xyzdot[3], void* un
 	}
 }
 
-/* Return barycentric coordinates for the sun */
 void get_sun_helio_coordsv(double jd,double xyz[3], double xyzdot[3], void* unused)
+{
+	Q_UNUSED(unused)
+	xyz[0]   =0.; xyz[1]   =0.; xyz[2]   =0.;
+	xyzdot[0]=0.; xyzdot[1]=0.; xyzdot[2]=0.;
+}
+
+/* Return barycentric coordinates for the sun */
+void get_sun_barycentric_coordsv(double jd,double xyz[3], double xyzdot[3], void* unused)
 {
 	Q_UNUSED(unused)
 	get_planet_bary_coordsv(jd, xyz, xyzdot, EPHEM_SUN_ID);