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For other uses, see North Pole (disambiguation).
Coordinates: 90 0? / ?90 0? / 90; -0

An Azimuthal projection showing the Arctic Ocean and the North Pole.

North Pole scenery
The North Pole, also known as the Geographic North Pole or Terrestrial North Pole is, subject to the caveats explained below, defined as the point in the northern hemisphere where the Earth's axis of rotation meets the Earth's surface. It should not be confused with the North Magnetic Pole.
The North Pole is the northernmost point on Earth, lying diametrically opposite the South Pole. It defines geodetic latitude 90 North, as well as the direction of True North. At the North Pole all directions point south, and as such its longitude can be defined as any degree value.
While the South Pole lies on a continental land mass, the North Pole is located in the middle of the Arctic Ocean amidst waters that are almost permanently covered with constantly shifting sea ice. This makes it impractical to construct a permanent station at the North Pole (unlike the South Pole). However, the Soviet Union, and later Russia, have constructed a number of manned drifting stations, some of which have passed over or very close to the Pole. Recently, scientists have predicted that the North Pole may become seasonally ice-free by 2050 due to Arctic shrinkage. More pessimistically, it was claimed by some scientists that the Arctic ice-cap might temporarily disappear in mid 2008, a prediction which did not come to pass. On December 15, 2008, the Canadian science TV series Daily Planet reported that scientists now predict the ice cap could melt away by 2014.
The sea depth at the North Pole has been measured at 4,261 metres (13,980 ft). The nearest land is usually said to be Kaffeklubben Island, off the northern coast of Greenland about 700km (440 mi) away, though some perhaps non-permanent gravel banks lie slightly further north.
Contents
1 Precise definition
2 Expeditions
2.1 Pre-1900
2.2 19001940
2.3 19402000
2.4 21st century
2.4.1 2007 descent to North Pole seabed
3 Day and night
4 Time
5 Climate
6 Flora and fauna
7 Territorial claims to the North Pole and Arctic regions
8 Cultural associations
9 See also
10 References
11 External links
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Precise definition
See also: Polar motion.
The Earth's axis of rotation and hence the position of the North Pole was commonly believed to be fixed (relative to the surface of the Earth) until, in the 18th century, the mathematician Leonhard Euler predicted that the axis might "wobble" slightly. Around the beginning of the 20th century astronomers noticed a small apparent "variation of latitude", as determined for a fixed point on Earth from the observation of stars. Part of this variation could be attributed to a wandering of the Pole across the Earth's surface, by a range of a few meters. The wandering has several periodic components and an irregular component. The component with a period of about 435 days is identified with the 8 month wandering predicted by Euler and is now called the Chandler wobble after its discoverer. The exact point of intersection of the Earth's axis and the Earth's surface, at any given moment, is called the "instantaneous pole", but because of the "wobble" this cannot be used as a definition of a fixed North Pole (or South Pole) when metre-scale precision is required.
It is desirable to tie the system of Earth coordinates (latitude, longitude, and elevations or orography) to fixed landforms. Of course, given continental drift and the rising and falling of land due to volcanoes, erosion and so on, there is no system in which all geographic features are fixed. Yet the International Earth Rotation and Reference Systems Service and the International Astronomical Union have defined a framework called the International Terrestrial Reference System. The North Pole of this system now defines geographic North for precision work, and it does not quite coincide with the rotation axis.
Expeditions
See also: Polar exploration, Farthest North and List of firsts
Pre-1900
As early as the sixteenth century, many eminent people believed (correctly) that the North Pole was in a sea, which in the nineteenth century was called the Polynia or Open Polar Sea. It was therefore hoped that passage could be found through ice floes at favorable times of the year. Several expeditions set out to find the way, generally with whaling ships, already commonly used in the cold northern latitudes.
One of the earliest expeditions to set out with the explicit intention of reaching the North Pole was that of British naval officer William Edward Parry, who in 1827 reached latitude 8245? North. In 1871 the Polaris expedition, an American attempt on the Pole led by Charles Francis Hall,...(and so on)

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