Arctic Circle | Britannica

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External Websites
  • Harvard International Review - Geopolitical Competition in The Arctic Circle
  • The Canadian Encyclopedia - Arctic Circle
  • Live Science - The Arctic Circle: Polar portal to the Arctic
  • CORE - Oil and Sustainability in the Arctic Circle
  • ABC listen - Passenger - Wonder at the natural phenomena of the Arctic Circle and the music it inspires
  • Digital Commons at DU - Oil and Sustainability in the Arctic Circle
Arctic regions
Arctic regions The Arctic regions are centred on the North Pole. (more)
Arctic Circle Ask Anything Homework Help Written and fact-checked by Britannica Editors Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Britannica Editors Last updated Jan. 31, 2026 •History Britannica AI Icon Britannica AI Ask Anything Table of Contents Table of Contents Ask Anything

News •

Frigid Air From Arctic Circle To Invade US This Weekend • Jan. 29, 2026, 12:48 AM ET (The Weather Channel) ...(Show more) Man City news: Official Supporters' Club praises the club's gesture to refund tickets • Jan. 22, 2026, 12:42 AM ET (BBC) Britain is in talks with NATO to boost Arctic security, agreeing with Trump on Russia and China • Jan. 12, 2026, 12:03 AM ET (Fortune) Show less
Arctic Ocean1 of 3
Arctic Ocean(more)
decline in minimum Arctic sea ice extent2 of 3
decline in minimum Arctic sea ice extentRemote sensing has revealed the loss in Arctic sea ice extent since the late 1970s.(more)
Arctic Circle3 of 3
Arctic Circle World map with the Arctic Circle marked.(more)

Arctic Circle, parallel, or line of latitude around Earth, at approximately 66°30′ N. Because of 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.

The Editors of Encyclopaedia Britannica This article was most recently revised and updated by Michele Metych.

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