Parry Arc - part of a halo display seen by Axel Michaelowa at Mittelberg, Kleinwalsertal, Austria. Image �Axel Michaelowa, shown with permission.
The Parry arc is sharp and narrow compared with the upper tangent arc beneath it. The improbably precise alignment of Parry oriented crystals produces rays deflected as from a fixed prism. Those from the tangent arc are mixtures of many crystal rotational positions.
Other halos were visible incuding a circumzenithal arc touched by a supralateral arc, sundogs, a 22 degree halo and a complete parhelic circle. Low in the mountains there was possibly a fragment of an infralateral arc.
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