Free Planetarium Software – Explore the stars and planets from your computer

Stellarium is a free open source planetarium for your computer.
It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope.
It is being used in planetarium projectors. Just set your coordinates and go.

minimum system requirements
Linux/Unix; Windows 7 and above; OS X 10.8.5 and above