Stellarium is a free open-source planatarium for your computer! It shows a realistic sky in 3D just like what you see with your naked eyes, binoculars or a telescope. Stellarium thus renders 3D photo-realistic skies in real time with OpenGL.
Its a treat to watch all the planets revolve stuffs, the various activities taking place in the skies in real time i.e if there is an eclipse taking place somewhere you can view the process using Stellarium. This awesome software needs no internet connection and runs totally based on your system time.
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Stellarium 0.10.2 for windows
Stellarium 0.10.1 for Linux
Stellarium 0.10.1 for Mac OS