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marking the location of the Arctic Circle in Alaska.]] The Arctic Circle is one of the five major Circles Of Latitude that mark maps of the Earth . It is the parallel of Latitude that (as of 2000) runs 66 ° 33′ 39″ (or 66.56083 ° ) north of the Equator . The region north of this circle is known as the Arctic , and the zone just to the south is called the Northern Temperate Zone . The equivalent latitude in the southern hemisphere is called the Antarctic Circle . The Arctic Circle marks the southern extremity of the Polar Day (24 hour sunlit day, often referred to as the " Midnight Sun ") and Polar Night (24 hour sunless night). North of the Arctic Circle, the Sun is above the Horizon for 24 continuous Hour s at least once per Year , and below the horizon for 24 continuous hours at least once per year. On the Arctic Circle these events occur, in principle, exactly once per year, at the June Solstice and December Solstice respectively. In fact, because of Atmospheric Refraction and because the sun appears as a disk and not a point, part of the midnight sun may be seen on the night of the summer solstice up to about 50 ′ (90 km) south of the Arctic Circle; similarly, on the day of the winter solstice part of the sun may be seen up to about 50′ north of the Arctic Circle. This is true at sea level; these limits increase with elevation above sea level, although in mountainous regions there is often no direct view of the horizon. The position of the Arctic Circle is not fixed, but varies in a complex manner over time; see ''circles Of Latitude'' for information. GEOGRAPHY AND DEMOGRAPHICS The geography north of the Article Circle is predominantly Ocean , mostly Ice-covered , but a great deal of land falls within the Circle as well. The Circle itself in fact passes through eight countries. From the Prime Meridian heading eastwards these are:
Very few people live north of the Arctic Circle due to the cold conditions. The three largest towns above the Arctic Circle are situated in Russia; Murmansk (population 325,100), Norilsk (135,000) and Vorkuta (85,000). Tromsø in Norway has about 62,000 inhabitants, whereas Rovaniemi in Finland — which lies slightly south of the line — has slightly fewer than 58,000. Recently the region north of the Article Circle has gained significant international attention due primarily to s which may become accessible if the ice covering them melts.''The great Arctic Circle oil rush'', CNN.com, 8 Aug, 2007 These factors have led to recent international debates as to which nations can claim sovereignty or ownership over the waters north of the Circle.''Russia stakes its claim on North Pole in underwater search for oil'', Times Online, 28 July, 2007[http://www.timesonline.co.uk/tol/news/world/europe/article2155477.ece SEE ALSO
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