Lunar halo and moon dogs (paraselene), 19th-century illustration. These optical phenomena are caused by the refraction (bending) of moonlight by ice c

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Lunar halo and moon dogs (paraselene), 19th-century illustration. These optical phenomena are caused by the refraction (bending) of moonlight by ice crystals in cirrostratus clouds or fog. Observed from Stone Vicarage, Buckinghamshire, UK, by Swiss astronomer Vincent Fasel on 23 March 1853. Fasel worked at the Stone Observatory, Hartwell, from 1847 to 1853. Artwork from 'The Cycle of Celestial Objects continued at the Hartwell Observatory to 1859' (1860) by British astronomer William Henry Smyth (1788-1865).

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Size: 4940px × 3898px
Photo credit: © ROYAL ASTRONOMICAL SOCIETY/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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