Text written by the German physicist Joseph von Fraunhofer (1787-1826) describing optical phenomena associated with the Sun and caused by ice crystals in the atmosphere. The phenomena include halos, sun dogs (parahelia) and arcs. From Theorie der Hofe, Nebensonnen und verwandter Phanomene mit Versuchen zur Bestatigung derselben by Joseph von Fraunhofer (1825). | |
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