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Lars Finsen wrote:

> It wouldn't be beyond me to input the proper motions of the most 
> prominent stars and so calculate their positions at any given time using 
> some calculatory approach or other. But I guess some more readily 
> machine-readable (and better) proper motion data must be available 
> somewhere.

The Hipparcos and Tycho catalogues are available online.

http://en.wikipedia.org/wiki/Hipparcos
http://cdsarc.u-strasbg.fr/viz-bin/Cat?I/239