PanoTools:
so that's not flare?
jeffrey 2006-Jun-12 15:29:56
http://antwrp.gsfc.nasa.gov/apod/ap060411.html
A Sun Halo over Utah
Credit & Copyright: Doug Wilson
Explanation: Have you ever seen a halo around the Sun? This fairly
common sight occurs when high thin clouds containing millions of tiny
ice crystals cover much of the sky. Each ice crystal acts like a
miniature lens. Because most of the crystals have a similar elongated
hexagonal shape, light entering one crystal face and exiting through
the opposing face refracts 22 degrees, which corresponds to the radius
of the Sun Halo. A similar Moon Halo may be visible during the night.
The picture was taken in Gunlock, Utah, USA. A flock of birds was
caught by chance in the foreground. Exactly how ice-crystals form in
clouds remains under investigation.
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