This is looking good,and you're welcome ...a trick I use(and it's primitive I know) in order to get my spotlight lined up with the sun,or in this case the moon,is to quickly render enough to get the exact position of the light source,put your finger on it,click wireframe mode and move the spotlight to line up with  your finger. This gets you in the right area,and you can tweak from there...of course,you have to wipe off the screen a lot,but them's the breaks! I think you are getting close!