Stellarium is a planetarium software that shows a realistic 3D simulation of the night sky on your computer screen. It includes a default catalog with more than 600,000 stars, images of nebulae, a realistic Milky Way, as well as planets and their satellites (additional catalogs are available for download). You can click on each object to view the name, distance and other details and also zoom in for a closer look. The program can show the sky based on your current geographical location or any other place on earth. It also allows you to simulate movements by going back and forth in time at different speeds. Other features include very realistic atmosphere, sunrise and sunset simulations, star twinkling effects ans shooting stars, skinnable landscapes, constellations for eleven different cultures, night vision mode and more.