Added solar position test program

Author: anoved

test/solar/Makefile

@@ -0,0 +1,12 @@
+CPP = /usr/bin/g++
+CFLAGS = -g -Wall -fPIC -Wextra
+LIB_SGP4_DIR = ../../Libraries/sgp4/libsgp4
+LIB_SGP4 = $(LIB_SGP4_DIR)/libsgp4.a
+INCLUDES = -I $(LIB_SGP4_DIR)
+
+# -lrt required on linux for libsgp4's use of clock_gettime
+solarposition: solarposition.o $(LIB_SGP4)
+	$(CPP) solarposition.o $(LIB_SGP4) -lrt -o $@
+
+solarposition.o: solarposition.cpp
+	$(CPP) $(CFLAGS) $(INCLUDES) -c solarposition.cpp

test/solar/solarposition.cpp

@@ -0,0 +1,31 @@
+/*
+ * solarposition
+ * 
+ * This program prints the current julian date, the current greenwich sidereal
+ * time (earth rotation in radians), and current location of the sun, expressed
+ * in Earth-centered inertial coordinate system kilometers. (w is direct radius)
+ * It is intended as a reference for other ECI solar position implementations.
+ */
+
+#include <stdio.h>
+#include "DateTime.h"
+#include "SolarPosition.h"
+#include "Vector.h"
+
+int main(void) {
+	SolarPosition sp;
+	DateTime date = DateTime::Now();
+	Eci solar_eci = sp.FindPosition(date);
+	Vector pos_eci = solar_eci.Position();
+	double julianDate = date.ToJulian();
+	double gsidereal = date.ToGreenwichSiderealTime();
+	
+	printf("d: %lf\n", julianDate);
+	printf("g: %lf\n", gsidereal);
+	printf("x: %lf\n", pos_eci.x);
+	printf("y: %lf\n", pos_eci.y);
+	printf("z: %lf\n", pos_eci.z);
+	printf("w: %lf\n", pos_eci.w);
+	
+	return 0;
+}