Arctic Circle

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Arctic Circle, imaginary circle on the surface of the earth at 661/2°N latitude, i.e., 231/2° south of the North Pole. It marks the northernmost point at which the sun can be seen at the winter solstice (about Dec. 22) and the southernmost point of the northern polar regions at which the midnight sun is visible.

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Arctic Circle Northernmost of the Earth's parallels, 66.5° n of the Equator. At this latitude the sun neither sets on the day of summer solstice (June 21), nor rises on the day of winter solstice (December 22). See also Antarctic Circle