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. The program features over 120,000 stars complete with information about each one, constellation lines and maps, atmosphere effects, and more. It is a small download and can run on Windows, Macs, and Linux-based machines. Just set your coordinates and go.
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.
In version 0.8.0:
sky * over 120,000 stars from the Hipparcos catalogue with info * asterisms and illustrations of the constellations * images of nebulae * realistic Milky Way * very realistic atmosphere, sunrise and sunset * the planets and their satellites
interface * a powerful zoom * time control * multilingual interface * scripting to record and play your own shows * fisheye projection for planetarium domes * spheric mirror projection for your own dome * graphical interface and extensive keyboard 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...
Stellarium is a free GPL software which renders realistic skies in real time with openGL. It is available for Linux/Unix, Windows and MacOSX. With Stellarium, you really see what you can see with your eyes, binoculars or a small telescope.