|
Credit & Copyright: Regina Kelly
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.
Featured here is a particularly striking display of
anticrepuscular rays photographed earlier this month in
Westminster,
Colorado,
USA.
Deja vu:
Anticrepuscular Rays over Colorado (I)
|
January February March April May June July August September October November December |
| ||||||||||||||||||||||||||||||||||||||||||||||||
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
Publications with keywords: anticrepuscular rays
Publications with words: anticrepuscular rays
See also: