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Parallel of latitude approximately 66°30 south of the Equator that circumscribes the southern frigid zone. It marks the northern 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 southward from the Antarctic Circle, mounting to six months at the South Pole.
This entry comes from Encyclopædia Britannica Concise. For the full entry on Antarctic Circle, visit Britannica.com.
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