Online Encyclopedia

ANTHELION (late Gr. avOil]uos, opposi...

Online Encyclopedia
Originally appearing in Volume V02, Page 93 of the 1911 Encyclopedia Britannica.
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ANTHELION (
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late Gr. avOil]uos, opposite the sun)
  , the luminous ring or
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halo sometimes seen in Alpine or polar regions surrounding the shadow of the head of an observer cast upon a
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bank of cloud or mist . The halo diminishes in brightness from the centre outwards, and is probably due to the diffraction of
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light . Under favourable 'conditions four concentric rings may be seen round the shadow of the observer's head, the outermost, which seldom appears, having an angular
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radius of 400 .

End of Article: ANTHELION (late Gr. avOil]uos, opposite the sun)
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