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Parallel of latitude approximately 66°30 north of the Equator that circumscribes the northern frigid zone. It marks the southern limit of the area within which, for one day or more each year, the sun does not set or rise. The length of continuous day or night increases northward from the Arctic Circle, mounting to six months at the North Pole.
This entry comes from Encyclopædia Britannica Concise. For the full entry on Arctic Circle, visit Britannica.com.
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