Are there websites or programs that permit a simulation of the night sky in the past and the future on an ordinary computer?
(For the past, I would be content with objects visible to the naked eye.)
Answer
The two main free destop programs that I know about, Stellarium and Celestia, do not include the proper motion of the stars when they move forward and backward in time. At least according to documentation that I've seen.
These programs claim to do it but I have no experience with them:
However, the Distant World Star Mapper at the Astoronomy Nexus will compute the proper motion when rendering sky maps. It's not a full simulation but can provide some information.
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