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Open Source Stellarium

Stellarium is available for Linux, Mac OSx and Windows:

Features:

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...