For regions inside the polar circles, the maximum lengths of the time that the Sun is completely below the horizon varies from zero a quarter degree beyond the Arctic Circle and Antarctic Circle to 179 days at the Poles.
42.
In 1735 and 1736 brought out two treatises on the figure of the earth; but these attempts to solve geometrical problems by literary material were, to a great extent, refuted by Maupertuis'measurements of a degree within the polar circle.
43.
Because of atmospheric refraction, and also because the sun is a disk rather than a point, the midnight sun may be experienced at latitudes slightly below the polar circle, though not exceeding one degree ( depending on local conditions ).
44.
:: What physical mechanism causes the sun to rise and set at the poles ? ( I mean " precisely at " the poles, not just within the polar circles . )-- Smack 02 : 57, 15 May 2004 ( UTC)
45.
As a result, ( approximately, and on average ) the Tropical Circles are drifting towards the equator ( and the Polar Circles towards the poles ) by 15 metres per year, and the area of the Tropics is decreasing by per year.
46.
Areas inside each polar circle and its associated pole ( North Pole or South Pole ), known geographically as the extended object rather than a point source, the continuous daylight area is somewhat extended while the continuous darkness area is somewhat reduced.
47.
The positions of the Tropical and Polar circles are not fixed because the axial tilt changes slowly a complex motion determined by the superimposition of many different cycles ( some of which are described below ) with short to very long periods.
48.
Pick the annual Polar Circle Marathon on the Arctic Circle, or the tougher five-day Greenland Adventure Race _ kayaking 40 kilometers ( 25 miles ), mountain biking for 50 kilometers ( 30 miles ) and then running 95 kilometers ( 60 miles ).
49.
Finally, the Earth's rotational axis is not exactly fixed in the Earth, but undergoes small fluctuations ( on the order of 15 meters ) called polar motion, which have a small effect on the Tropics and Polar circles and also on the Equator.
50.
Nutation makes a small change to the angle at which the Earth tilts with respect to the Sun, changing the location of the major circles of latitude that are defined by the Earth's tilt ( the tropical circles and the polar circles ).
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