What’s
happening behind those clouds? Although the scene may appear somehow supernatural, nothing more unusual is occurring
than a Sun setting on the other side of the sky.
Pictured here 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. Featured here is a particularly
striking display of anticrepuscular rays photographed in 2016
over Dry Tortugas National Park in Florida, USA.
Image and
info via APOD
Image Credit
& Copyright: Bryan Goff
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