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Left:
This circumzenithal arc was visible for over half an hour. Here a cloud conveniently blocks out some of the glare from the sun.
Bottom Left:
The sun altitude was 22 degrees when this image was taken and most of the arc is visible. Unfortunately it was a fairly hazy afternoon which reduced the contrast.
Bottom Right:
A little later the arc started to brighten, but was more broken. Lower level cloud then moved in and blocked the view, by the time it cleared the arc was gone.
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Canon EOS 20D 22nd April 2006
Wiltshire, England