'GREGORY G. DIMIJIAN, M.D.' / SCIENCE PHOTO LIBRARY 'GREGORY G. DIMIJIAN, M.D.' / SCIENCE PHOTO LIBRARY
Solar halo, 22 degrees in radius, seen above Yellow Fever Tree woodland, Nakuru National Park, Kenya. A solar halo is an optical phenomenon caused by ice crystals in the atmosphere. This photograph was taken with a 16mm fisheye lens.
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