Patches of cirrus mingled with old jet contrails show a little bit of colour as they pass through the region where the circumhorizon arc is visible. The solar altitude was 61 degrees.
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This image is about 60 degrees wide with the visible part of the circumhorizon arc taking more than half the width.
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The sections of cloud are shown in more detail. Traces of spectral colours show up, unfortunately just a tiny fraction of what is possible.
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Canon EOS 20D 4th June 2006
Wiltshire, England