Usually means: Rainbow-like circle above observer.
Definitions Related words Mentions
We found 6 dictionaries that define the word circumzenithal arc:

General (2 matching dictionaries)
  1. circumzenithal arc: Merriam-Webster
  2. Circumzenithal arc: Wikipedia, the Free Encyclopedia

Computing (2 matching dictionaries)
  1. circumzenithal arc, Circumzenithal arc: Encyclopedia

Science (1 matching dictionary)
  1. Circumzenithal Arc: Eric Weisstein's World of Astronomy

Tech (1 matching dictionary)
  1. Glossary of Meteorology (No longer online)

Definitions from Wikipedia (Circumzenithal arc)

noun:  The circumzenithal arc, also called the circumzenith arc , the upside-down rainbow, and the Bravais arc,"Mémoire sur les halos et les phénomènes optiques qui les accompagnent", J. de l' École Royale Polytechnique 31(18), 1-270, A. Bravais, 1847 is an optical phenomenon similar in appearance to a rainbow, but belonging to the family of halos arising from refraction of sunlight through ice crystals, generally in cirrus or cirrostratus clouds, rather than from raindrops.


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