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http://www.stellarium.org/

 

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http://www.stellarium.org/wiki/index.php/%EC%9E%90%EC%A3%BC_%EB%AC%BC%EC%96%B4%EB%B3%B4%EB%8A%94_%EB%82%B4%EC%9A%A9%EB%93%A4#.EC.8A.A4.ED.85.94.EB.9D.BC.EB.A6.AC.EC.9B.80.EC.9D.80_.EC.96.B4.EB.96.BB.EA.B2.8C_.EC.84.A4.EC.B9.98.ED.95.98.EB.82.98.EC.9A.94.3F