Skip to comments.Astronomy Picture of the Day -- Anticrepuscular Rays Over Wyoming
Posted on 02/21/2012 9:06:41 PM PST by SunkenCiv
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 last month near Cheyenne, Wyoming, USA.
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[Credit & Copyright: Nate Cassell]
Uh. Those straight lines are curved!
It might seem that lines diverging and then re-converging must be curved lines, but it’s a perspective view. Each is a straight line unless compared to any of the others. It’s due to our fish-eye view of the world.
Would have been a pretty neat picture if the photographer had tried to keep those damn windmills out of it.
Very cool but I have to admit I'm even more fascinated by the detail the enlarged pic provides.
Can we call them something else? Too pretty to be stuck with that monicker.
Crepuscular sounds like a skin disease.
OOOOOOOOO Thats all I can say.
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