Stellarium is an open-source planetarium program that has gained a considerable popularity together with other free and open-source astronomical programs such as Celestia and KStars. What makes Stellarium a standout among a plethora of other contenders is its balance of features and the simplicity it offers for a novice user while maintaining a high scientific accuracy.
http://ubuntumanual.org/posts/387/stellarium-a-free-planetarium-software-for-star-gazing-in-ubuntu
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