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Space Anticrepuscular Rays Over Colorado

Discussion in 'Tech, Science, and Space' started by Robby, Nov 16, 2008.

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  1. Robby

    Robby The Robot

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    NASA Astronomy Picture Of The Day
    Anticrepuscular Rays Over Colorado


    [​IMG]


    Anticrepuscular Rays Over Colorado
    Credit & Copyright: John Britton

    Explanation: What's happening over the horizon? Although the scene may appear somehow supernatural, nothing more unusual is occurring than a setting Sun and some well placed clouds. Pictured above are anticrepuscular rays. To understand them, start by picturing common crepuscular rays that are seen any time that sunlight pours though scattered clouds. Now although sunlight indeed travels along straight lines, the projections of these lines onto the spherical sky are great circles. Therefore, the crepuscular rays from a setting (or rising) sun will appear to re-converge on the other side of the sky. At the anti-solar point 180 degrees around from the Sun, they are referred to as anticrepuscular rays. Pictured above is a particularly striking set of anticrepuscular rays photographed in 2001 from a moving car just outside of Boulder, Colorado, USA.



    (Via NASA)
     

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