circumzenithal arc

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circumzenithal arc [¦sər·kəm¦zē·nə·thəl ′ärk]

(optics)

A brilliant rainbow-colored arc of about a quarter of a circle with its center at the zenith and about 46° above the sun, produced by refraction and dispersion of the sun's light striking the top of prismatic ice crystals in the atmosphere, and usually lasting only a few minutes.

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No references found			7 Where did freak atmospheric conditions cause an upside-down rainbow - or circumzenithal arc to appear? Coffee time: The news quiz by Evening Chronicle (Newcastle, England) The phenomenon, called a circumzenithal arc, is rarely seen outside the polar regions and is hardly ever spotted in the UK. Over the wobniar* by The Mirror (London, England) Unlike a rainbow, which appears opposite the sun, a circumzenithal arc is centred around the zenith of the sky, and can only appear if the solar angle is less than 32 degrees. Somewhere UNDER the rainbow.. by Evening Gazette (Middlesbrough, England)			Circumcision circumduction circumference circumferentor Circumflex circumflex artery circumhorizontal arc Circumlocution Office, the circumlunar circummeridian altitude Circumnutation circumpharyngeal connective circumpolar Circumpolar Organism circumpolar star circumpolar westerlies circumpolar whirl circumradius circumscissile circumscribed circumstantial evidence circumstellar disk Circumtropical Organism circumvallate papilla Circumvallation circumzenithal arc Circus Circus Arena circut ciré cire perdue Cirebon Cirencester CIRIA Ciril Kosmac Ciro Alegria Ciro Alegría Ciro Menotti Cirolanidae Cirphis Loreyi Cirque Cirque Glacier cirque lake Cirratulidae Cirrhosis Cirrhosis of the Liver cirriform Cirripedia cirrocumulus cirrocumulus cloud Cirromorpha			circumventer circumventing circumventing circumvention circumvention Circumvention and Recovery circumvention of truth circumventions circumventions circumventive circumventive circumventor circumventor circumventricular circumventricular organ circumventricular organ Circumventricular organs circumvents circumvents Circumvest Circumvolant Circumvolation circumvolute circumvolute circumvolution circumvolutions circumvolve circumvolved circumvolves circumvolving circumzenithal arc Circunscrição Regional de Trânsito Circunscripción Electoral Municipal circus circus circus circus circus Circus (performing art) Circus (performing art) Circus (performing art) Circus (performing arts) Circus (performing arts) Circus (performing arts) circus acrobat Circus Aeruginosus Circus Agonensis Circus Arena Circus Balloon Club Circus cyaneus Circus cyaneus Circus Day Foundation Circus Fans Association of America Circus freak Circus freaks Circus Maximus Circus Maximus - In Rome, Italy circus movement circus movement circus movement circus movement

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