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.

by José E. García Batarse on 2009-05-22 01:32:31 [Original Size] - [Next Image] - [Author's gallery]