Thursday, February 28, 2013


This image was taken in Cabo Polonio, Uruguay in February 2012 by Vanesa Amarelle, around 3pm in very hot weather. Circumzenithal arcs form when downcoming sunrays enter the uppermost horizontal face of oriented plate crystals and then leave through a vertical side face. The result is the refraction of rays that produce very pure and well-separated prismatic colours; they look like upside-down rainbows.

Cabo Polonio is a caserío (hamlet), found on the tip of a moon-sliver shaped peninsula in the eastern coast of Uruguay in the Rocha Department.

See a previous post on circumzenithal arcs here:
More on Cabo Polonio here:
Image: Vanesa Amarelle

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