Category:  Nature Photography | Posted: February 13, 2010



Circumzenitial Arc

A Smile in the Sky

by cleo85

Unusual Contest Entry 
This Upside down Rainbow is real. It is also known as Circumzenital or Bravais Arc. It is an optical phenomenon similar to a rainbow but arises from refractions of sunlight through horizontally orientated ice crystals often as in the photo in cirrus clouds. The arc also commonly called ???a smile in the sky??? forms no more than one-quarter of a circle centered on the zenith and on the same side as the sun. The colors are from blue on the inside to red on the outside of the arc. They are stronger and purer than those of a rainbow because the colors are less overlapping in this formation.
The Location of the shot will be added after the contest voting ended.

Camera Sony DSC-H9
Focal length 5mm
F# f/5.6
Exposure 1/640 sec
ISO 100


Post Type Photography Mixed Media None
Traditional Phoyography, no mixed media



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