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.
Configuration window
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Description
The configuration window. The first thing you have to do is set your observing position and save it. The landscape is a panorama from the ESO facilities in Garching, near Munich, Germany. ESO is the European Organisation for Astronomical Research in the Southern Hemisphere, and is employing project leader Fabien Chéreau.