Arctic Circle"The line of latitude 66°34′N (often taken as 66°N). Along this line the sun does not set on the day of the summer solstice, about June 21, and does not rise on the day of the winter solstice, about December 22.
Arctic Circle Poleward of this latitude (66 degrees 33 minutes N) there are 24 hours of sunlight at the summer solstice and 24 hours of darkness at the winter solstice.
Arctic Circle The parallel of latitude that is approximately 66.5 degrees north of the equator and that circumscribes the northern frigid zone.
ARCTIC CIRCLE - The latitude line of 66.5 south latitude.
AOA - Acronym used for "At Or Above" in abbreviated weather message products.
ANTARCTIC Of or relating to the area around the geographic South Pole, from 90 degrees South to the Antarctic Circle at approximately 66 1/2 degrees South latitude, including the continent of Antarctica.
By midwinter the Arctic Circle, 2,000 miles north of Fargo, has not seen sunlight for days or weeks. Having to travel a longer path through the atmosphere, the winter sunlight is weakest in January.
South to the Antarctic Circle at approximately 66 1/2?South latitude, including the continent of Antarctica.
Polar day In polar regions, the portion of the year when the Sun is continuously in the sky. Its length changes from twenty hours at the Arctic/Antarctic Circle (latitude 66°33' N or S) to 186 days at the North/South Pole.
ArcticThe region within the Arctic Circle, or, loosely, northern regions in general, characterized by very low temperatures.Arctic frontThe boundary or front separating deep, cold arctic air from shallower, relatively less cold polar air.
 See also: Arctic, High, Summer, Latitude, Surface
  
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