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A glider catches a lift on a thermal while far above the milky cirrus shows a good upper tangent arc. |
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The 22 degree halo was very weak so most of the colour at the top of the halo comes from the tangent arc. The flatter curve of the tangent arc can be seen where it splits away from the circular halo. (Solar altitude was 48 degrees) |
Canon EOS 20D 8th July 2006
Wiltshire, England
