anthelion

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halo

, in meteorology
halo, in meteorology, short-lived circles or arcs, and less commonly spikes and crosses, of colored or whitish light surrounding the moon or sun or in clouds as seen from above. A halo occurs when the light from the sun or the moon is refracted and reflected by ice crystals in the atmosphere, usually in a thin layer of high cirrostratus clouds. Under certain circumstances a second, or outer, halo appears, which is fainter than the inner one. At times white or colored luminous arcs are also seen lying somewhat parallel to the horizon and passing through the source of light, called mock suns, parhelia, or sun dogs for the sun, and paraselenae for the moon. A single mock sun, the anthelion, directly opposite the sun, may be added. In general a white halo results from the reflection of light by ice crystals, while one which appears as colored rings results from the refraction of light by ice crystals. Halos are more brilliant and complex near the poles than in other parts of the world. The theory attributing their formation to the presence of ice crystals was first suggested by the 17th cent. French philosopher Descartes. Similar to a halo and sometimes confused with it is the sun's corona. In X-ray electron diffraction, the term halos refers to the broad rings that appear on a photographic film as a result of the diffraction of a monoenergetic beam of X rays or electrons from a crystalline powder located at the center of the camera.
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anthelion

[ant′hēl·yən]
(astronomy)
A luminous white spot which occasionally appears on the parhelic circle 180° in azimuth away from the sun. Also known as counter sun.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Within the Alcyonaria only the blue coral, Heliopora coerulea, and one species of Anthelia sp.
PAMPER yourself at the Iberostar Grand Hotel Anthelia's Thai spa.
TENERIFE: Sovereign (0871 664 0227) offers seven nights' half-board in four-star Iberostar Grand Hotel Anthelia on stays between Mar 30 and May 4 from pounds 705 ex-Gatwick, including flights and transfers.
Like Anthelia Melincourt in Peacock's Melincourt (1817), Rosalind would like to marry but does hot intend to do so unless she tan find a man who embodies her imaginary ideal of perfection.
We would like to hear about any anthelia that readers have seen.
SOVEREIGN Luxury Travel (0843 770 4526, www.sovereign.com), is offering a saving of up to PS906 on a week's B&B at the five star Iberostar Hotel Anthelia, Tenerife, from PS2,429 per family of three.
e renovated Iberostar Grand Hotel Anthelia, on Tenerife's Costa Adeje, has 61 family rooms featuring bath toys, kids' bathrobes and minibars with milk, hot chocolate and yoghurts.
The Insotel Club in Menorca's Punta Prima Iberostar Grand Hotel Anthelia, in Tenerife All action...
Furthermore, in brooding species like the soft corals Xenia umbellata and Anthelia glauca, where zooxanthellae are transmitted maternally, infection does not occur until the later stages of embryogenesis or larval development (Benayahu et al., 1988; Benayahu and Schleyer, 1998).
We found the object of our desire in a wintersun package brochure - the Grand Hotel Anthelia in Costa Adeje, near Playa de las Americas.