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NOVAS , the U.S. Naval Observatory's Vector Astrometry Software, an integrated package of subroutines and functions for computing various commonly needed quantities in positional astronomy.

SOFA, the IAU's Standards of Fundamental Astronomy, an accessible and authoritative set of algorithms and procedures that implement standard models used in fundamental astronomy.

This article was originally based on Jason Harris' Astroinfo, which comes along with KStars, a KDE Desktop Planetarium for Linux/KDE.