The position of the Antarctic Circle is not fixed and currently runs 66°33′48.4″ south of the Equator. Early sailors used the same instruments as early astronomers to help guide them back home. [2]) 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. However, because of atmospheric refraction and mirages, and because the sun appears as a disk and not a point, part of the midnight sun may be seen on the night of the southern summer solstice up to about 50 minutes (′) (90 km (56 mi)) north of the Antarctic Circle; similarly, on the day of the southern winter solstice, part of the sun may be seen up to about 50′ south of the Antarctic Circle. Definition of the-antarctic-circle noun in Oxford Advanced Learner's Dictionary. [3] Consequently, the Antarctic Circle is currently drifting southwards at a speed of about 15 m (49 ft) per year. We use cookies to enhance your experience on our website, including to provide targeted advertising and track usage. Starting at the prime meridian and heading eastwards, the Antarctic Circle passes through: NB: This refers to the true geometric centre which actually appears higher in the sky because of refraction by the atmosphere. It is the parallel of latitude at 66° 33′ 39″ south of the Equator, crossing mostly the Southern Ocean. Antarctic Circle - WordReference English dictionary, questions, discussion and forums. n. (Physical Geography) 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. The Antarctic Circle definition is - an imaginary line that goes around the Earth near the South Pole. Enrich your vocabulary with the English Definition dictionary According to [[Sunrise],] "Sunrise is the moment when the upper limb of the Sun appears on the horizon". 'All Intensive Purposes' or 'All Intents and Purposes'? The breadth and quantity of its content expands periodically. It is actually an imaginary line placed to the south of the Equator. What does antarctic circle mean? The circumference of the Antarctic Circle is roughly 16,000 kilometres (9,900 mi). [3] 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 . We use cookies to enhance your experience on our website, including to provide targeted advertising and track usage. There is no permanent human population south of the Antarctic Circle, but there are several research stations in Antarctica operated by various nations that are inhabited by teams of scientists who rotate on a seasonal basis. Antarctic Circle is of interest to WikiProject Geographical coordinates, ... so I would assume that the antarctic circle has a similar definition. Antarctic Circle n the imaginary circle around the earth, parallel to the equator, at latitude 66° 32′ S More from Merriam-Webster on antarctic circle, Nglish: Translation of antarctic circle for Spanish Speakers, Britannica.com: Encyclopedia article about antarctic circle. Accessed 27 Dec. 2020. Antarctic circle definition is - the parallel of latitude that is approximately 661/2 degrees south of the equator and that circumscribes the southern frigid zone. Take a look at this picture of some of the lines of latitude. 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