Stellarium

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. All you have to do is to set your coordinates and go.

Here are some key features of "Stellarium":

default catalogue of over 600,000 stars extra catalogues with more than 210 million stars asterisms and illustrations of the constellations constellations for twelve different cultures images of nebulae (full Messier catalogue) realistic Milky Way very realistic atmosphere, sunrise and sunset the planets and their satellites

a powerful zoom time control multilingual interface fisheye projection for planetarium domes spheric mirror projection for your own low-cost dome all new graphical interface and extensive keyboard control telescope control

equatorial and azimuthal grids star twinkling shooting stars eclipse simulation skinnable landscapes, now with spheric panorama projection

Customisability: plugin system adding artifical satellites, ocular simulation, telescrope configuration and more add your own deep sky objects, landscapes, constellation images, scripts