Halo Around the Moon

By: P-M Heden


Region: Europe

Country: Sweden

Date: March 2010


Time-lapse video: a large 22-degree halo shapes around the Moon or the sun when high thin clouds containing millions of tiny ice crystals cover much of the sky. Each ice crystal acts like a miniature lens. Because most of the crystals have a similar elongated hexagonal shape, light entering one crystal face and exiting through the opposing face refracts 22 degrees, which corresponds to the radius of the Sun or the Moon Halo. In this video from Sweden, the brightest star in the field (at left) is in fact planet Mars (near its opposition with the Earth). Between Mars and the Moon the twin bright stars are Castor and Pollux in Gemini, while Capella (another bright winter star) is notable near the top. P-M Heden, Clearskies.se

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