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This halo started with fairly strong upper and lower tangent arcs joined up by a weaker 22 degree halo. The right edge is a bit obscured by the vertical streak of cirrus. |
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5 minutes later the upper tangent was brighter and more colourful, but the 22 degree halo had almost disappeared. |
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90 minutes later a completely different type of cirrus moved in, giving this smooth but almost colourless halo.
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Canon EOS 20D 9th May 2009
Wiltshire, England
