noun (plural parhelia /pɑːˈhiːlɪə/)
A bright spot in the sky appearing on either side of the sun, formed by refraction of sunlight through ice crystals high in the atmosphere. Also called mock sun, sun dog.
- Haloes may be accompanied by a whole array of circumzenithal arcs and parhelion (mock suns).
- By the riverside he seized on a sign: three suns in the sky (a rare astrological phenomenon known as a parhelion) to inspire in his troops and himself a moment of intense self-belief.
Mid 17th century: from Latin parelion, from Greek para- 'beside' + hēlios 'sun'.
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