1. Antarctic Circle - Noun
2. Antarctic Circle - Proper noun
a line of latitude north of the south pole
Source: WordNetOn December 21, people south of the Antarctic Circle see daylight for 24 hours as they circle around the South Pole as Earth rotates. Source: Internet
Voyagers round the Horn frequently met with contrary winds and were driven southward into snowy skies and ice-encumbered seas; but so far as can be ascertained none of them before 1770 reached the Antarctic Circle, or knew it, if they did. Source: Internet
On the other hand, places on the Antarctic Circle (latitude 66.56° south) will see the Sun just on the horizon during midday, and all places south of it will not see the Sun above horizon at any time of the day. Source: Internet
The south polar latitudes below the Antarctic Circle are in daylight whilst the north polar latitudes above the Arctic Circle are in night. Source: Internet