Free Open Source Planetarium, Stellarium

Stellarium is a good free open source planetarium for your computer. Stellarium 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!

Stellarium is compatible Linux, Mac OSX, Windows and default catalogue contains over 600,000 stars. It displays stars, constellations, planets, nebulas and others things like ground, landscape, atmosphere, etc.

 Features Version 0.10.2

    * 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

interface

    * 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

visualisation

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

customisability

    * add your own deep sky objects, landscapes, constellation images, scripts...

Download 40,2 Mbyte.

Link: download an excellent free open source Planetarium, Stellarium.