From http://stellarium.free.fr/ :
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Stellarium is a free software available for Windows, Linux/Unix and MacOSX. It
renders 3D photo-realistic skies in real time. With stellarium, you really see
what you can see with your eyes, binoculars or a small telescope.
Features :
* Over 120000 stars from the Hipparcos Catalogue with name and infos for the
brightest ones.
* Planets in real time, with a powerfull zoom mode to see them like in a
telescope.
* Drawing of the 88 constellations with their names.
* Drawing of more than 40 messiers objects (Orion, M31 etc..).
* Photorealistic Milky Way.
* Ground, fog, and landscape.
* Star twinkling.
* Grids in Equatorial and Azimuthal coordinates.
* Time control (real time and accelered time modes).
* Graphical menu for simple utilisation.
* Clikable stars, planets and nebulas with informations.
* Ecliptic and celestrial equator lines.
* Smooth real time navigation.
* Windowed and fullscreen modes.
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... and now it does so in Gentoo. Ebuild to be attached shortly...
