A Day In the year the Sun is immersed in the Arctic Circle

Arctic Circle

Alvienova | A Day In the year the Sun is immersed in the Arctic Circle | The Arctic Circle is one of the five major circles of latitude that mark maps of the Earth. In 2012, this circle is the parallel of latitude that runs Template: Circle of latitude north of the equator.

The northern region is known as the Arctic circle, and the southern zone only to be called the North Temperate Zone. Which is equivalent to the polar circle in the Southern Hemisphere is called the Antarctic Circle.

The Arctic Circle marks the southern end of the polar day (24-hour sunlit, often referred to as the midnight sun) and polar night (24-hours without the sun). The north of the Arctic Circle, the sun is above the horizon for 24 continuous hours at least once per year (and therefore visible in the middle of the night) and below the horizon for 24 continuous hours at least once per year. At the Arctic Circle those events occur, in principle, exactly once per year, at the solstice in June and December, respectively. In fact, because of atmospheric refraction and because the sun appears as a disc rather than a point, part of the midnight sun can be seen at night in the northern summer solstice up to about 50 '(90 km (56 mi)) south of the Arctic Circle, as well, in the northern part of the winter solstice, the sun was visible to the north about 50 'in the Arctic Circle. The position of the Arctic Circle is not fixed, but depends directly on the Earth's axial tilt, which fluctuates in a margin of 2 ° over a period of 40,000 years, [2] is mainly due to tidal forces resulting from the moon's orbit. The Arctic Circle is currently drifting north at about 15 m (49 ft) per year.

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