Turn Your Computer Into A Planetarium with Open Source App Stellarium

stellarium screenshot

Stellarium is an open-source application (works on Linux, Windows and Mac OSX) with a database of more than 210 billion stars, planets and major satellites which it can display in real-time, right on your computer.

At its most basic, Stellarium will display the night sky as seen from anywhere on earth. Delving into the more advanced features you can do all sorts of really interesting things like see the constellations for a dozen different cultures—the Pegasus from Greek mythology is the Turtle in the Navajo tradition.