Arctic Circle

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Arctic Circle,

imaginary circle on the surface of the earth at 66 1-2°N latitude, i.e., 23 1-2° south of the North Pole. It marks the northernmost point at which the sun can be seen at the winter solsticesolstice
[Lat.,=sun stands still], in astronomy, either of the two points on the ecliptic that lie midway between the equinoxes (separated from them by an angular distance of 90°).
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 (about Dec. 22) and the southernmost point of the northern polar regions at which the midnight sunmidnight sun,
phenomenon in which the sun remains visible in the sky continuously for 24 hr or longer, occurring only in the polar regions. The midnight sun is due to the fact that the plane of the earth's equator is tilted about 23 1-2° to the plane of the ecliptic (the
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 is visible.

Arctic Circle

[¦ärd·ik ′sər·kəl]
(geodesy)
The parallel of latitude 66°32′N (often taken as 66½°N).

Arctic Circle

the imaginary circle round the earth, parallel to the equator, at latitude 66° 32ʹ N; it marks the northernmost point at which the sun appears above the level of the horizon on the winter solstice
References in periodicals archive ?
It is a harbinger of what is likely happening in other circumpolar arctic deltas, where little is known about the impact of global warming.
Persistent organic pollutants (POPs) bioaccumulate in the bodies of the Arctic's human residents; and climate change is already deepening the active layer of the permafrost and eroding the beachfronts of coastal villages in the Circumpolar Arctic.
The eight states of the circumpolar Arctic now co-operate in an Arctic Council to protect the natural environment and promote sustainable development.
Circumpolar Arctic vegetation map (1:7,500,000 scale).
The leaders of the circumpolar Arctic regions realized the need for an Arctic policy long before such a policy became institutionalized.
Aquatic ecosystem changes across the circumpolar Arctic were found to occur in the late-19th and early 20th centuries.
The Arctic Science and Technology Information System (ASTIS) now contains 81 000 records describing 63 500 publications and 17 500 research projects about northern Canada and the circumpolar Arctic.
Dan White, director of the University of Alaska Fairbanks (UAF) Institute of Northern Engineering, says UAF specializes in circumpolar Arctic engineering and has worked in Russia and Canada as well as Alaska.
The entire world population of the Glaucous Gull Larus hyperboreus breeds in the circumpolar Arctic.
ANWR is truly everyone's crown jewel, not just the crown jewel of the circumpolar Arctic from a greenie point of view; it's also a crown jewel of the whole petroleum industry in the circumpolar Arctic," explains Becky Gay, executive director of the Alaska Resource Development Council.
The Status of Glaucous Gulls Larus hyperboreus in the Circumpolar Arctic.
The Arctic Science and Technology Information System (ASTIS) now contains 80 000 records describing publications and research projects about northern Canada and the circumpolar Arctic.