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Physics - Light/Optics

Featured Photo

photo of crepuscular rays over a sunset ocean.
Crepuscular rays or "God rays" are sunbeams that originate when the sun is below the horizon, during twilight hours. Crepuscular rays are noticeable when the contrast between light and dark are most obvious. Crepuscular comes from the Latin word "crepusculum", meaning twilight.
Photo by Luis Argerich.  Flickr image,  Attribution 2.0 Generic (CC by 2.0)
This is a freely licensed work, as explained in the Definition of Free Cultural Works."
Date accessed: 3/22/2012

Crespuscular & Anti-Crespuscular Rays