[juanre]

For those of you interested in the topic, the best publicly available database I've found is http://www.astronexus.com/node/34, and The Book for astronomical computation is Astronomical Algorithms, by Jean Meeus, http://www.willbell.com/math/mc1.HTM

(Shameless plug: I used both to implement the Common Lisp sky renderization engine for my startup, http://greaterskies.com, that makes pretty personalized posters out of thousands of stars)