Hi, If you are a sailor with interest in celestial navigation or an (amateur)astronomer who wishes to compute the position of the Moon with sub-meter precision or if you want to make your own 'Astronomical Almanac', please checkout: http://pynovas.sourceforge.net/ This software is in first alpha release, but it can be used if you know what you are doing. See for background information: http://aa.usno.navy.mil/software/novas/novas_info.html http://ssd.jpl.nasa.gov/eph_info.html Jaap Spies