Berlin Corona

April 20, 2008


Provided by: Verena Tiessen
Summary authors & editors: Jim Foster, Verena Tiessen 

The composite photo above of a magnificent lunar corona over Berlin, Germany was taken on November 26, 2007. Coronas are produced by diffraction of moonlight or sunlight by micrometer (┬Ám) sized cloud droplets, typically found in mid-level altocumulus or altostratus clouds. Often these thin clouds are difficult to detect at night, but when positioned near a gibbous or full Moon, the colorful rings that result give them away.

Photo details: Canon EOS 350D camera, 50 mm (Sigma 18-125 mm) lens. This image is a combination of three pictures, each with a slightly different exposure.