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Halo Display, Colorado Rockies Imaged by Chad Cardwell.
©Chad Cardwell, shown
   with permission.

At left is a dazzlingly bright sundog. The sun is off picture at far left.

A parhelic circle courses horizontally across the sky.

The strongly coloured arcs at right and twice as far from the sun as the sundog are supralateral and infralateral arcs. They are made by sunlight passing through a side face and an end face of horizontal column crystals. They are often mistaken for the much more rare 46° halo.

Supralateral arcs
46 halo?
Parhelic circle