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Astronomy Picture of the Day -- Anticrepuscular Rays Over Wyoming
| February 21, 2012
| (see photo credit)
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.
(Excerpt) Read more at 126.96.36.199 ...
TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: apod; astronomy; science; wyoming
[Credit & Copyright: Nate Cassell]
posted on 02/21/2012 9:06:45 PM PST
To: brytlea; cripplecreek; decimon; bigheadfred; KoRn; Grammy; married21; steelyourfaith; Mmogamer; ...
You know you have to look.
posted on 02/21/2012 9:08:21 PM PST
(FReep this FReepathon!)
Uh. Those straight lines are curved!
posted on 02/21/2012 9:09:13 PM PST
by null and void
(Day 1127 of America's ObamaVacation from reality [Heroes aren't made, Frank, they're cornered...])
To: null and void
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.
posted on 02/21/2012 9:40:35 PM PST
by Telepathic Intruder
(The right thing is not always the popular thing)
Would have been a pretty neat picture if the photographer had tried to keep those damn windmills out of it.
posted on 02/21/2012 10:04:20 PM PST
(It's time for the DemocRAT voter base to start paying their "fair share" of taxes.)
Very cool but I have to admit I'm even more fascinated by the detail the enlarged pic provides.
posted on 02/21/2012 11:30:05 PM PST
by I see my hands
(The old sod ne'er shall be forgot.)
Can we call them something else? Too pretty to be stuck with that monicker.
Crepuscular sounds like a skin disease.
posted on 02/22/2012 2:45:46 AM PST
Crepuscular - occurring at dawn and dusk. Cats are crepuscular, they sleep a lot of the time and are most active at dawn and dusk when it is easier to catch prey. </pedantry!!>
Great picture, Mr. Civilizations!
posted on 02/22/2012 7:53:50 AM PST
(FReepmail me to get ON or OFF the ZOT LIGHTNING ping list)
OOOOOOOOO Thats all I can say.
posted on 02/22/2012 10:29:52 AM PST
(An ounce of chocolate is worth a pound of cure)
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