diff --git a/Time/sunpos.c b/Time/sunpos.c
index 25cfc0981..93c3f9ea0 100644
--- a/Time/sunpos.c
+++ b/Time/sunpos.c
@@ -285,6 +285,8 @@ void fgUpdateSunPos(struct fgCartesianPoint scenery_center) {
     t->sun_vec[0] = t->fg_sunpos.x - scenery_center.x; 
     t->sun_vec[1] = t->fg_sunpos.y - scenery_center.y;
     t->sun_vec[2] = t->fg_sunpos.z - scenery_center.z;
+    MAT3_SCALE_VEC(t->sun_vec, t->sun_vec, -1.0);
+
     /* make this a directional light source only */
     t->sun_vec[3] = 0.0;
 
@@ -303,9 +305,12 @@ void fgUpdateSunPos(struct fgCartesianPoint scenery_center) {
 
 
 /* $Log$
-/* Revision 1.11  1997/10/28 21:07:21  curt
-/* Changed GLUT/ -> Main/
+/* Revision 1.12  1997/11/15 18:15:39  curt
+/* Reverse direction of sun vector, so object normals can be more normal.
 /*
+ * Revision 1.11  1997/10/28 21:07:21  curt
+ * Changed GLUT/ -> Main/
+ *
  * Revision 1.10  1997/09/13 02:00:09  curt
  * Mostly working on stars and generating sidereal time for accurate star
  * placement.