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A weak 22 degree halo on the left joins up with part of an upper tangent arc to produce this odd looking halo. |
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This upper tangent arc showed a reasonable amount of colour. At a solar altitude of 41 degrees the arc has a very shallow curve compared to the circular 22 degree halo. |
In this closer view some 20 minutes later another patch of cirrus has produced a strong upper tangent with no sign of the 22 degree halo. |
Canon EOS 20D 9th September 2006
Wiltshire, England
