The Arctic Circle is the invisible circle of latitude on the earth's surface at 66°33' north, marking the southern limit of the area where the sun does not rise on the winter solstice or set on the summer solstice. It is approximately 1,650 miles from the North Pole. The Arctic Circle is also the outermost parallel circle as measured from the North Pole where the sun cannot be seen above the horizon during the winter solstice on December 21st. Continuous day or night ranges from one day at the Arctic Circle to six months at the North Pole. The Arctic Circle is also the name given the geographic arctic region around the North Pole. It includes the Arctic Ocean and the northern parts of three continents. A region rich in natural resources and spectacular beauty, the Arctic Circle region is one of the last frontiers on the planet.
 http://www.riversedge.net/arctic-circle-daytour.htm
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