Astronomical Software
Naval Observatory Software Products ~
MICA - Multiyear Interactive Computer Almanac
NOVAS - Naval Observatory Vector Astrometry Subroutines
AstroNavPC and Compact Data 2001-2005
Standards Of Fundamental Astronomy (SOFA) Libraries
WinStars:(left click to download) 3.16MB: Win9x/Me/NT4/2000/XP:
Author: Franck Richard
A complete planetarium, showing you the appearance of the sky, as seen from anywhere on Earth, for any date. Easy navigation links quickly give you various information about all aspects within the program. You can also get additional freeware planetry files.

Visit their Website for additional planetry files
Planet Visibility2.0: (left click to download) 5.33MB: Win9x:
Authors: Noel M. Swerdlow, The University of Chicago and Rainer Lange
This program displays a 3-color graph which shows when a planet, moon or sun is visible during any year from 3000 BC to AD 6000 at any location on the earth. Months and hours are marked by verical & horizontal axis.The times of sunrise and sunset can be shown on all the diagrams. By moving the mouse over the diagram, the date and time along with the object’s altitude, azimuth, and magnitude, or the phase of the moon, are displayed. Additionally, it includes diagrams of solar and lunar eclipses, of the rotation, inclination, illumination, and apparent size of the bodies, and of Jupiter’s satellites.Settings & graphics can be Saved & Printed. A very comprehensive package with many more features. Indepth planetry info plus full documentation at the website