Bright Circumzenithal Arc

One of the few circumzenithal arcs I've seen this year but by far the brightest.

Halfway between the arc and the sun (behind the chimney) is a hint of the top of the 22 degree halo, or perhaps an upper tangent arc.

Sadly it didn't last long as the thicker cirrus moved in.

Canon EOS 5D   1st July 2011
Berkshire, England

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