Upper and Lower Tangent Arcs

The upper tangent arc is often stronger than the 22 degree halo and can be a bit more colourful, though not as much as the circumzenithal arc for example.

Both the upper and lower tangent arcs are visible here. The 22 degree halo was barely visible which indicates the ice crystals were not randomly oriented.

Canon EOS 20D   11th August 2005
Wiltshire, England

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