Anticrepuscular Rays

Photo: John Britton

Astronomy Picture of the Day has yet another fantastic photo - this one is of anticrepuscular rays over Colorado:

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.


FYI, here's a pic of crepuscular ray they're talking about above:

Photo: PiccoloNamek [Wikipedia]

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It reminds me of one of Jules Vernes' novel : 'The Green Ray' ("Le rayon vert"), where the search for such magical light moment becomes a search for love....
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