Stellarium is a free, open source planetarium program for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope. Includes constellations for 15 different cultures and an eclipse simulation. Bring a true planetarium to you and your classroom.
Stellarium
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Resource Link: http://stellarium.org/
( Link may be down. We are checking into it. )