Illustration by the German physicist Joseph von Fraunhofer (1787-1826) showing rays of sunlight (from top) being diffracted by ice crystals (circles from a to b) in the atmosphere. Depending on the angle of diffraction, this can cause a number of atmospheric optical phenomena associated with the Sun, including halos, sun dogs (parahelia) and arcs. From Theorie der Hofe, Nebensonnen und verwandter Phanomene mit Versuchen zur Bestatigung derselben by Joseph von Fraunhofer (1825). | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / ETH-Bibliotek Zurich |
Taille de l’image : | 2904 px × 3618 px |
Model Release : | Non requis |
Property Release : | Non requis |
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