There are also moon dogs that appear alongside the moon and are formed by lunar light passing through ice crystals. They are frequently observed on a ring or halo around the sun. Sundogs often appear as colored areas of light to the left or right of the sun, 22 degrees distant and at the same distance above the horizon as the sun. (Image credit: Don Brown, Utah Skies (opens in new tab)) The ice crystals must be preferentially oriented horizontally and the sun-observer line of sight must be close to horizontal in order to see such a site. Taken by Don Brown with an Olympus OM1 and a 28mm lens, this image shows two parhelia on each side of the sun and one just visible at the top of the image. Called sundogs, this phenomenon is caused by sunlight being refracted through ice crystals. This beautiful picture was captured at sunrise on a cold and still Park City morning.
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