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This is a nice landmark with a big observatory in the mountain that holds a 2.1 meters telescope. As the stars move through the night sky the draw a circular track. The color and its bright depends on the magnitude and spectral class of the source star.

Picture by José E. García Batarse with 7 hours of exposition. It is important to use low ISO speed for capturing star trails, because a long exposition would overexpose the image otherwise.

 
 
2011-08-19 23:27:24       
Furrealz? That's marveolusly good to know.
 
2011-04-12 00:40:07       
Home run! Great slugging with that aswner!
 
2009-05-22 02:09:53       
The observatory dome seems to be moving.
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