I just found this video from Adobe that explains how to correct auto white balance in star time-lapses using PhotoShop CS5. It’s far from easy and requires the newest version of PhotoShop, but this will help a lot of beginning photographers. I previously explained why white balance is important to time-lapse. I might try to adapt this technique for my earlier version of the software. It could be useful to change the night sky color in case I make a mistake setting my white balance.