I figured that I would give some words after testing this mod. I will say one thing. You guys are in for a real treat. This is probably one of the most creative mods I have played for GTA. It is up there in the Iron Man, Back To The Future, Spider Man, etc.. realm, but with an exploratory aspect.
Also, I figured I would post this here since I practically filled sollaholla's inbox with testing info/images and encase the public probably would have ideas/info to improve it more. I was playing around with the timecyc and timecyc modifiers. They will need some modifying but it is entirely possible to have good lighting. Also if success is made with cracking that shadow boundary, the lighting will look even better, not to mention a more suitable timecyc. This is just a concept.
Even having night zones on the planet from space is possible.
There is only one bug, but I know a clever concept to fix it. The lighting effects are on the sky box. My theory is that when the lighted areas are darkened, the light side won't look so bright and the shift will be less noticeable. The dark side of the sky box can be "washed out by the sun". The sun's corona would have to be brightened a lot (which IMHO, I think it should be brighter). The thing is, the dark areas need to be darkened a lot. Since there is no air in space, light isn't reflected. So shadows are much much darker. The bright sun corona will definitely make up for the space light shift. In the real solar system, when you look towards the sun, there is no way in hell your going to see the stars because its so freaking bright. lol.
Edit: Some cockpit images.
Two more from the Moon.