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   Parry Arc III 

Parry and upper tangent arcs at low sun. Captured by Gerd Pfeiffer at Konz, Germany on 8th April at 19.50 CEST, sun elevation 3.5�.

Parry arcs change dramatically in appearance as the sun elevation changes. Here the sunvex Parry arc, the uppermost arc, closely resembles the tangent arc just beneath it giving the appearance of a double halo.

Image �Gerd Pfeiffer, used with permission.