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ANTHELION ( See also: halo sometimes seen in Alpine or polar regions surrounding the See also: shadow of the See also: head of an observer cast upon a See also: bank of cloud or mist
.
The halo diminishes in brightness from the centre outwards, and is probably due to the diffraction of See also: 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 See also: radius of 400
.
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