anthelion

From Glossary of Meteorology
A luminous white spot that appears on the parhelic circle 180° in azimuth away from the sun.

The origin of anthelion is not settled. The brightness of this spot may be due partly to the superposition of the parhelic circle and of the anthelic arcs, which intersect the parhelic circle at this point. Other candidate mechanisms giving light to anthelion have been suggested.

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