Moon dogs

Moon dogs

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Credit: STEPHEN J. KRASEMANN/SCIENCE PHOTO LIBRARY

Caption: Moon dogs, a halo, a parhelic circle and an upper tangent arc seen around the Moon (centre) in the night sky. The Moon dogs, the two patches of light on either side of the Moon, are formed by the refraction of its light by horizontal ice crystals in clouds in the atmosphere. The halo, the large circle around the Moon, is formed when light is refracted 22 degrees towards the observer by crystals. The parhelic circle, the band of light (far left to far right) running through the Moon dogs, is formed when light is refracted from the ends of flat ice crystals. The upper tangent arc intersects the parhelic circle at the Moon dogs. Photographed in Yukon, Canada.

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Keywords: atmospheric effect, canada, cirrus, climate, cloud, clouds, cloudy, dog, dogs, effects, halo, light, meteorology, moon, night sky, parhelia, parhelic circle, parhelion, refracted, refracting, refraction, sunlight, upper tangent arc, weather, yukon

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