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the imaginary circle around the earth, parallel to the equator, at latitude 66° 32′ S; it marks the southernmost point at which the sun appears above the level of the horizon at the winter solstice 南极圈
His boat crossed the Antarctic Circle in three places, but he still failed to sight land.
VOA: special.2009.06.03
Environment California estimate that plastic bags kill up to one million sea creatures every year, and the British Antarctic Survey have found them floating far north of the Arctic Circle, and as far south as the Falkland Islands.