Arctic Circle

southern boundary of the North Frigid Zone which is situates south of the North Pole

The Arctic Circle is one of the five major circles of latitude that mark maps of the Earth. It is the parallel of latitude that (as of 2000) runs 66° 33′ 39″ (or 66.56083°) north of the Equator. The region north of this circle is known as the Arctic, and the zone just to the south is called the Northern Temperate Zone. The equivalent latitude in the southern hemisphere is called the Antarctic Circle.
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Noun
1. a line of latitude near but south of the north pole; it marks the northernmost point at which the sun is visible on the northern winter solstice and the southernmost point at which the midnight sun can be seen on the northern summer solstice
(hypernym) polar circle

arctic circle
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