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 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. South of the Antarctic Circle, the Sun is above the horizon for 24 continuous hours at least once per year (and therefore visible at midnight) and the centre of the Sun (ignoring refraction) is below the horizon for 24 continuous hours at least once per year (and therefore not visible at noon); this is also true within the equivalent polar circle in the Northern Hemisphere, the Arctic Circle.
The position of the Antarctic Circle is not fixed and currently runs 66°33′49.9″ south of the Equator.[1] This figure may be slightly inaccurate because it does not allow for the effects of astronomical nutation, which can be up to 10″. Its latitude depends on the Earth's axial tilt, which fluctuates within a margin of more than 2° over a 41,000-year period, due to tidal forces resulting from the orbit of the Moon.[2] Consequently, the Antarctic Circle is currently drifting southwards at a speed of about 14.5 m (48 ft) per year.
^"Obliquity of the Ecliptic (Eps Mean)". Neoprogrammics.com. Archived from the original on 2017-06-12. Retrieved 2014-05-13.
^Berger, A.L. (1976). "Obliquity and Precession for the Last 5000000 Years". Astronomy and Astrophysics. 51 (1): 127–135. Bibcode:1976A&A....51..127B.
The AntarcticCircle is the most southerly of the five major circles of latitude that mark maps of Earth. The region south of this circle is known as...
exist in the far south of the globe. The term Antarctic, referring to the opposite of the Arctic Circle, was coined by Marinus of Tyre in the 2nd century...
A polar circle is a geographic term for a conditional circular line (arc) referring either to the Arctic Circle or the AntarcticCircle. These are two...
2024: Arctic Circle (66°33′49.9″ N) Tropic of Cancer (23°26′10.1″ N) Equator (0° latitude) Tropic of Capricorn (23°26′10.1″ S) AntarcticCircle (66°33′49...
into the "Southern Ocean" and the "Antarctick [sic] Ocean" along the AntarcticCircle, with the northern limit of the Southern Ocean being lines joining...
Earth at about 66° 34' N. Its southern equivalent is the AntarcticCircle. The Arctic Circle marks the southernmost latitude at which, on the Northern...
occurs in the summer months in places north of the Arctic Circle or south of the AntarcticCircle, when the Sun remains visible at the local midnight. When...
Situated almost entirely south of the AntarcticCircle and surrounded by the Southern Ocean (also known as the Antarctic Ocean), it contains the geographic...
the South Pole and largely south of the Antarctic Circle. It is washed by the Southern (or Antarctic) Ocean or, depending on definition, the southern Pacific...
The Antarctic (/ænˈtɑːrtɪk/ or /ænˈtɑːrktɪk/, American English also /æntˈɑːrtɪk/ or /æntˈɑːrktɪk/; commonly /æˈnɑːrtɪk/) is a polar region around Earth's...
major circles of latitude that mark maps of Earth, the others being the Arctic and Antarcticcircles and the Equator. The positions of these two circles of...
System) South Shetland Islands (Antarctic Treaty System) Geography portal Anthony de la Roché AntarcticAntarcticCircleAntarctic Circumpolar Wave Polar front...
the sky. Locations further north than the Arctic Circle and further south than the AntarcticCircle experience no full sunset or sunrise on at least one...
Antarctica would be located in all time zones; however, areas south of the AntarcticCircle experience extreme day-night cycles near the times of the June and...
process his expedition became the first recorded voyage to cross the AntarcticCircle. He did hypothesize that, based upon the amount of ice, there must...
250; 69.583) 1772–1775 – James Cook – sails HMS Resolution crossing AntarcticCircle in January 1773 and December 1773. On 30 January 1774 he reaches 71° 10′ S...
23°26′10.1″ S and the AntarcticCircle at 66°33′49.9″ S, covers 25.99% of Earth's surface. The South Frigid Zone, from the AntarcticCircle at 66°33′49.9″ S...
The Antarctic Circumpolar Wave (ACW) is a coupled ocean/atmosphere wave that circles the Southern Ocean in approximately eight years at 6–8 cm/s (2.4–3...
west forms a great circle with the 160th meridian east. In Antarctica, the meridian defines the border between the British Antarctic Territory and Queen...
The 70th parallel south is a circle of latitude that is 70 degrees south of the Earth's equatorial plane in the Antarctic. The parallel passes through...
(or close to) the Arctic Circle, i.e. the Arctic Any of the world's southern regions below (or close to) the AntarcticCircle, usually Antarctica A nickname...
69°30′S 65°00′W / 69.500°S 65.000°W / -69.500; -65.000 The Antarctic Peninsula, known as O'Higgins Land in Chile and Tierra de San Martín in Argentina...
circle is located at a latitude between these two areas, at approximately 66.5°. While it is day in the Arctic Circle, it is night in the Antarctic Circle...
eastwards, the parallel 80° south passes through: 79th parallel south List of Antarctic and sub-Antarctic islands South Pole 80°S 0°E / 80°S 0°E / -80; 0...
Michael B.; Edwards, Marion (1984). "A dipteran from south of the AntarcticCircle: Belgica antarctica (Chironomidae) with a description of its larva"...
The 75th parallel south is a circle of latitude that is 75 degrees south of the Earth's equatorial plane in the Antarctic. It passes through the Southern...
stands for Antarctica, the semi-sphere represents the area below the AntarcticCircle, and the hands represent human protection of the environment. For high...
(latitudes 23°26′10.1″) to the Arctic Circle (66°33′49.9″), and Tropic of Capricorn (-23°26′10.1″) to the AntarcticCircle (-66°33′49.9″). They include Earth's...
continuous daylight can only occur north of the Arctic Circle and south of the AntarcticCircle.) At the South Pole, a completely different set of constellations...
east forms a great circle with the 20th meridian west. In Antarctica, the meridian defines the border between the Australian Antarctic Territory and the...
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