Celestia is a 3D astronomy program created by Chris Laurel. The program, based on the Hipparcos Catalogue, allows the user to display objects ranging in scale from artificial satellites to entire galaxies in three dimensions using OpenGL, from perspectives which would not be possible from a classic planetarium or other ground based display. NASA and ESA have used Celestia in their educational and outreach programs, as well as for interfacing to trajectory analysis software. Celestia is available for Linux, Mac OS X, and Microsoft Windows. Released under the GNU General Public License, Celestia is free software. Functions survey in Celestia]] Celestia displays the Hipparcos Catalogue of almost 120,000 stars. Celestia uses the very accurate VSOP87 theory of planetary orbits. This makes it possible for it to provide a Solar and lunar eclipse finder and to display the or

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