Parhelic-circle sentence example

parhelic-circle
  • Passing through the luminary and parallel to the horizon, there is a white luminous circle, the parhelic circle (P), on which a number of images of the luminary appear.
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  • The other images on the parhelic circle are the paranthelia (q) and the anthelion (a) (from the Greek av-ri, opposite, and iXcos, the sun).
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  • Thomas Young explained the parhelic circle (P) as due to reflection from the vertical faces of the long prisms and the bases of the short ones.
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  • When the sun is near the horizon the rays fall upon the principal section of the prisms; the minimum deviation for such rays is 22 °, and consequently the parhelia are not only on the inner halo, but also on the parhelic circle.
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  • Double internal reflection by a triangular prism would form a single coloured image on the parhelic circle at about 98° from the sun.
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  • The emerging rays are parallel to their original direction and form a colourless image on the parhelic circle opposite the sun.
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  • To the right of the 120° parhelion, the otherwise colorless parhelic circle is very slightly blue ~ the ' blue spot ' .
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  • When the sun is near the horizon the rays fall upon the principal section of the prisms; the minimum deviation for such rays is 22 °, and consequently the parhelia are not only on the inner halo, but also on the parhelic circle.
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  • Double internal reflection by a triangular prism would form a single coloured image on the parhelic circle at about 98° from the sun.
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