antarctic circle definition
Map of the Antarctic with the Antarctic Circle in blue. The Antarctic Circle is the most southerly of the five major circles of latitude that mark maps of the Earth. The region south of this circle is known as the Antarctic, and the zone immediately to the north is called the Southern Temperate Zone.
Arctic Circle definition. Imaginary circle around the Earth about three-quarters of the way from the equator to the North Pole. North of this line is the âLand of the Midnight Sun,â where the sun never sets on the summer solstice. Note: The Arctic Circle corresponds to the Antarctic Circle in the Southern Hemisphere.