- anthelic arc
- The term anthelic arc is indebted to the Greek words anti (against, opposite to) and helios (Sun). It translates loosely as 'arc located opposite to the Sun'. The term is used in meteorology and physics to denote a collection of rare "physical illusions taking the shape of a huge, thin "halo that can be seen against the part of the sky facing the Sun (i.e. the antisolar point). Anthelic arcs can be observed both in the presence and in the absence of "anthelia. They are generally classified as atmospheric effects resulting from the interaction of sunlight and ice crystals with a particular orientation high in the atmosphere.ReferencesLynch, D.K., Schwartz, P. (1979). Origin of the anthelion. Journal of the Optical Society of America, 69, 383-386.Lynch, D.K., Livingston, W. (1995). Color and light in nature. Cambridge: Cambridge University Press.
Dictionary of Hallucinations. J.D. Blom. 2010.
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anthelic arc — /ant hee lik, an thee / a rare halo occurring at the sun s elevation but in the opposite part of the sky. [ANTHEL(ION) + IC] * * * … Universalium
anthelic arc — /ant hee lik, an thee / a rare halo occurring at the sun s elevation but in the opposite part of the sky. [ANTHEL(ION) + IC] … Useful english dictionary
Arc — may refer to: Computing and gaming*Arc (programming language), a Lisp dialect in development by Paul Graham *.arc, a file extension for archive files *arc, the command line interface for ArcInfo *Arc System Works, a video game… … Wikipedia
Subhelic arc — A subhelic arc is a rare halo, formed by internal reflection through ice crystals, that curves upwards from the horizon and touches the tricker arc above the anthelic point. Subhelic arcs are a result of ray entrance and exit through prism end… … Wikipedia
subhelic arc — noun A rare halo, formed by internal reflection through ice crystals, that curves upwards from the horizon and touches the tricker arc above the anthelic point … Wiktionary
physical illusion — Also known as stimulus distortion illusion. Both terms refer to an * illusion attributable to physical rather than neurophysiological or cognitive mechanisms. Some examples of physical illusions are the * mirage, the * rainbow, the * anthelic… … Dictionary of Hallucinations
Anthelion — An anthelion (plural anthelia, from late Greek ανθηλιος, opposite the sun ) is a rare optical phenomenon appearing on the parhelic circle opposite to the sun as a faint white halo, not unlike a sundog.How anthelions are formed is disputed. Walter … Wikipedia
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Subparhelic circle — The subparhelic circle is a rare halo, an optical phenomenon located below the horizon. It passes through both the subsun, below the sun, and the antisolar point, opposite to the sun. The subparhelic circle is the subhorizon counterpart to the… … Wikipedia