Partial 22 Degree Halo

Thin cirrus in a blue sky gave a moderately colourful upper tangent arc.

A couple of hours later the cirrus was more general and the colour in the tangent arc was very weak. There was only a hint of 22 degree halo.

Half an hour later the 22 degree halo was much more prominent.


Canon EOS 20D   28th June 2009
Wiltshire, England

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