MyStars! is a scientifically rigorous, yet fun and educational Windows astronomy program that simulates the sky and helps you visualize and locate the positions of stars, planets, comets, minor planets, and Messier (M) objects from any location on earth and any date/time from BC 2000 to AD 6000. The registered version also shows the moon with phases, solar and lunar eclipses, and the 118,000 Hipparcos Star Catalogue.