Quote Originally Posted by selden View Post
Celestia doesn't include proper motions at all, so it wouldn't be any help. I haven't taken them into account, either. I don't have Starry Night, so I don't know how it handles those.
Now that you mention it, neither do I. For all I know, it is simply rotating the entire celestial sphere as a single body of fixed stars. Fortunately, my particular project is just the Solar System, not the individual twinklies.