This series of constant exposures shows how the sky darkens and the noctilucent cloud disappears as the shadow moves north.
The exposures were all 2 seconds, with the sun 10.1, 10.9 and 12.0 degrees below the horizon.
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These noctilucent clouds were much higher in the sky than usual, but it was far too late for them to be normal cirrus catching the sun.
21:45 UT, sun 10.2 degrees below the horizon.
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It didn't last long though and the higher, more southerly, parts of the cloud vanished as the shadow advanced.
21:53 UT, sun 10.9 degrees below the horizon.
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Soon we were left with the more usual appearance of a distant band low in the north.
22:08 UT, sun 12.0 degrees below the horizon.
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Canon EOS 20D 14th July 2006
Wiltshire, England