Antarctic Circle

Antarctic Circle is the most southerly of the five major circles of latitude that mark maps of the Earth. Antarctica lies almost entirely south of this line.

The region south of this circle is known as the Antarctic, and the zone immediately to the north is called the Southern Temperate Zone. South of the Antarctic Circle, the sun is above the horizon for twenty-four continuous hours at least once per year, and the center of the sun (ignoring refraction) is below the horizon for twenty-four continuous hours at least once per year. Due to Earth's axial tilt, the Antarctic Circle is currently drifting southwards at a speed of about 15 m (49 ft) per year.