circumzenithal arc

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• Circumzenithal arc — July 10, 2005. High above the horizon over Grand Forks, ND, January 2007 …   Wikipedia

• circumzenithal arc — | ̷ ̷ ̷ ̷ at circum +... noun Etymology: International Scientific Vocabulary circum + zenithal; originally formed as French circumzénithal : a bright rainbow colored circular halo arc about the zenith as center convex to the sun and about 46… …   Useful english dictionary

• arc — 1. arc [ ark ] n. m. • 1080; lat. arcus 1 ♦ Arme formée d une tige souple (de bois, de métal) que l on courbe au moyen d une corde attachée aux deux extrémités pour lancer des flèches. Arc et arbalète. Bander, tendre l arc. Tirer des flèches avec …   Encyclopédie Universelle

• Arc circumzénithal — L arc circumzénithal est un phénomène lumineux qui se forme dans les cirrus ou les trainées de condensation. Il a l apparence d un arc en ciel qui se forme au zénith et qui est courbé dans la direction opposée au soleil. Il est créé par les… …   Wikipédia en Français

• Kern arc — The Kern arc is the extremely rare atmospheric optical phenomenon related to the circumzenithal arc. It is a complete and faint circle around the zenith. The circle extends a partial circle of the circumzenithal arc.The Kern arc is named after H …   Wikipedia

• Circumhorizontal arc — in relation to 22° arc, Oregon A circumhorizontal arc is an optical phenomenon an ice halo formed by plate shaped ice crystals in high level cirrus clouds. The current accepted names are circumhorizon arc or lower symmetric 46° plate arc[1] The… …   Wikipedia

• Supralateral arc — A supralateral arc is a rare halo, an optical phenomenon often confused with the indeed infrequently appearing 46° halo. Distinguishing between the two is furthermore difficult as supralateral arcs typically only appears in fragments while the… …   Wikipedia

• Parry arc — A Parry arc is a rare halo, an optical phenomenon which occasionally appears over a 22° halo together with a upper tangent arc. Discovery The halo was first described by Sir William Edward Parry (1790 1855) in 1820 during one of his Arctic… …   Wikipedia

• Upper tangent arc — An upper tangent arc is a halo, an atmospheric optical phenomenon which appears over and tangent to the 22° halo centred around the sun.The shape of an upper tangent arc varies with the elevation of the sun; while the sun is low (less than… …   Wikipedia

• Infralateral arc — An infralateral arc (or lower lateral tangent arc) is a rare halo, an optical phenomenon appearing similar to a rainbow under a white parhelic circle. Together with the supralateral arc they are always located outside the seldom observable 46°… …   Wikipedia

• quasi-tangent arc — “+... noun : circumzenithal arc …   Useful english dictionary