Antarctic Circle

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Antarctic Circle, imaginary circle on the surface of the earth at 661/2°S lat., i.e., 231/2° north of the South Pole. It marks the southernmost point at which the sun can be seen at the winter solstice (about June 22) and the northernmost point of the southern polar regions at which the midnight sun is visible.

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