Stellurium is a free open source planetarium application and give you virtual sky in 3D, just like what you see with the naked eye, a telescope. Stellarium allows people to use their home computer as a virtual planetarium. It calculates the positions of the Sun and Moon, planets and stars, and draws how the sky would look to an observer depending on their location and the time. Also it is a good educational tool for teaching about the night sky. You can use it to create sky maps for describing regions of the sky in articles for newsletters and magazines.[adsense]
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