- Arctic Circle
an imaginary line drawn parallel to the equator, at 23°28prime; S of the North Pole: between the North Frigid Zone and the North Temperate Zone. See diag. under zone.
* * *Parallel of latitude approximately 66.5° north of the Equator that circumscribes the northern frigid zone. It marks the southern limit of the area within which, for one day or more each year, the sun does not set or rise. The length of continuous day or night increases northward from the Arctic Circle, mounting to six months at the North Pole.
* * *parallel, or line of latitude around the Earth, at approximately 66°30′ N. Because of the Earth's inclination of about 23 1/2° to the vertical, it marks the southern limit of the area within which, for one day or more each year, the Sun does not set (about June 21) or rise (about December 21). The length of continuous day or night increases northward from one day on the Arctic Circle to six months at the North Pole. The Antarctic Circle is the southern counterpart of the Arctic Circle, where on any given date conditions of daylight or darkness are exactly opposite.
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Look at other dictionaries:
Arctic Circle — 1550s, in reference to a celestial circle, a line around the sky which, in any location, bounds the stars which are ever visible from that latitude (in the Northern Hemisphere, this is focused on the celestial north pole); the concept goes back… … Etymology dictionary
Arctic Circle — Arctic Cir|cle the Arctic Circle an imaginary line around the world at a particular distance from the most northern point, which is the North Pole →↑Antarctic Circle … Dictionary of contemporary English
Arctic Circle — [also a c ] an imaginary circle parallel to the equator, c. 66°34′ north of it: see LATITUDE … English World dictionary
Arctic Circle — This article is about one of the five major circles of latitude. For other uses, see Arctic Circle (disambiguation). World map showing the Arctic Circle in red … Wikipedia
Arctic Circle — noun a line of latitude near but to the south of the north pole; it marks the northernmost point at which the sun is visible on the northern winter solstice and the southernmost point at which the midnight sun can be seen on the northern summer… … Useful english dictionary
Arctic Circle — N PROPER: the N The Arctic Circle is an imaginary line drawn around the northern part of the world at approximately 66° North … English dictionary
Arctic Circle — Arctic Ocean, but arctic fox … Bryson’s dictionary for writers and editors
arctic circle — noun The parallel of latitude that runs 66° 33′ 39″ north of the Equator. The region north of this circle is known as the Arctic … Wiktionary
Arctic Circle — noun (singular) an imaginary line drawn around the world at a certain distance from the most northern point (the North Pole) compare Antarctic Circle … Longman dictionary of contemporary English
arctic circle — noun Usage: often capitalized A&C Date: 1622 the parallel of latitude that is approximately 66 1/2 degrees north of the equator and that circumscribes the northern frigid zone … New Collegiate Dictionary