The North Pole

The North Pole is the limit point of the geographic coordinate system in the Northern Hemisphere. Latitude reaches its maximum value of +90° there; longitude is undefined; the entire family of meridians described by the /learn/meridians-of-longitude support collapses into a single point. This article covers the geometry, the four distinct senses of “north pole”, the physical setting of the geographic pole in the Arctic Ocean, the polar-motion wobble that moves the pole by a few metres in space, and the history of human attainment of the pole — including the still-unresolved early disputes.

Definition and geometry

The geographic North Pole is the point on Earth's surface where the rotation axis emerges in the Northern Hemisphere. Per the IERS Conventions, the rotation axis is defined by the IERS Reference Pole, which is fixed by convention; the instantaneous pole differs from the IERS reference by the polar-motion vector, described in the next section.

At the geographic pole:

• Latitude is exactly +90°
• Longitude is undefined — every meridian passes through the pole
• All four cardinal directions but one degenerate: every direction from the pole points south
• The Sun's declination determines whether it is above or below the horizon (above from March equinox to September equinox; below the rest of the year, refraction-adjusted)

The undefined longitude is a real issue for coordinate systems. Software that treats latitude/longitude as a regular two-dimensional grid runs into singularities at the poles; algorithms that work in the geocentric Cartesian frame (ECEF coordinates) or on a unit sphere avoid the problem. Projections handle the pole differently: polar stereographic projections place the pole at the centre of the map; Mercator clips well short of the pole (Web Mercator at ±85.05°); azimuthal projections from the pole are well-defined and undistorted at the centre.

The four north poles

Four distinct points on or near Earth's surface carry the name “north pole”:

Geographic North Pole — the rotation-axis intersection, latitude +90°. This is the “true” north pole that this article is about. It is fixed by the IERS Reference Frame plus polar motion.

Magnetic North Pole (also called the dip pole or the North Magnetic Pole) — the point where the geomagnetic field is vertical, pointing straight down into the Earth. Per the NOAA NCEI World Magnetic Model 2025, the Magnetic North Pole is currently in the Arctic Ocean north of Russia at approximately 86°N, 142°E. It moves tens of kilometres each year because the geomagnetic field is generated by fluid motion in Earth's liquid outer core. In the 20th century it sat in northern Canada and drifted slowly; from roughly 1990 it began moving rapidly across the Arctic Ocean toward Russia, with peak drift rates of about 55 km/year in the late 2010s before slowing somewhat in the 2020s. The /learn/the-world-magnetic-model support covers the modelling and the 2019 emergency out-of-cycle update prompted by the rapid drift.

Geomagnetic North Pole — the intersection of Earth's idealised geomagnetic dipole axis with the surface, currently at about 80°N, 73°W in northwestern Greenland. The geomagnetic pole moves much more slowly than the magnetic pole because it tracks the underlying dipole orientation rather than the full field structure. It is the pole around which the auroral oval is roughly centred.

Arctic Pole of Inaccessibility — the point in the Arctic Ocean farthest from any coastline, approximately 85°48′N, 176°9′W. It is a geographic curiosity, defined by the surrounding landmasses rather than by any rotational or magnetic property of the planet. It is meaningful for sea-ice studies and for navigation challenge records.

Polar motion

The instantaneous geographic North Pole does not sit at a single fixed point; it wobbles around the IERS Reference Pole. The wobble has two main components per the IERS Conventions:

• Chandler wobble — a quasi-circular motion of about 9 m radius with a 433-day period, driven by mass redistribution in the atmosphere and oceans plus internal mantle/core couplings.
• Annual wobble — a smaller seasonal motion (~3 m radius) driven by annual climatological cycles.

The combination produces a roughly six-year beat pattern in the position of the instantaneous pole. The IERS publishes the polar motion daily in IERS Bulletin A, which gives the x and y offsets of the instantaneous pole in milliarcseconds.

Beyond the periodic wobble, the long-term mean of the pole position is drifting. Through most of the 20th century the drift was toward Hudson Bay at about 10 cm/year. Beginning around 2000 the drift direction rotated abruptly eastward, now pointing roughly toward Greenland; the shift has been attributed in part to mass redistribution from melting ice sheets and groundwater depletion. The drift is small in human terms — a few metres per generation — but is monitored continuously by the global VLBI and GPS network.

Physical setting

The geographic North Pole sits in the Arctic Ocean. There is no land at the pole. The seafloor beneath the pole is at about 4,200 m depth over the Lomonosov Ridge, an underwater mountain chain that bisects the central Arctic basin. The ridge has been the focus of overlapping sovereignty claims from Russia, Canada, and Denmark (Greenland), each of which argues that the ridge is a geological extension of its continental shelf — a UNCLOS-defined extension that would, if accepted, extend the claimant's exclusive economic zone to or near the pole. The Commission on the Limits of the Continental Shelf is the ITU-level body that adjudicates such claims; the case is still unresolved.

The sea-ice cover above the pole varies dramatically with the seasons and has thinned over the satellite era. Per NSIDC records, the ice at the pole drifts in the Beaufort Gyre and Transpolar Drift Stream patterns at typical rates of about 5–10 km/day. There is no permanent ice cover at the pole in the long-term sense — the ice that floats over the pole today will be many hundreds of kilometres away within a year.

Day length and time

At the pole, day length is governed entirely by solar declination, with no diurnal variation:

• Polar day runs from approximately 18 March (when the Sun rises above the horizon for the season) to 25 September (when it sets) — about 191 days of continuous daylight, allowing for refraction.
• Polar night runs roughly from 25 September to 18 March — about 174 days of continuous twilight or darkness, again refraction-adjusted.
• The transition seasons are gradual: civil, nautical, and astronomical twilight each last several weeks at the pole as the Sun's declination changes only ±0.4°/day.

Time zones converge at the pole because all meridians converge there. By convention, visitors and ice-camp expeditions use UTC. (At the South Pole, the /learn/the-south-pole support notes that the Amundsen-Scott Station uses New Zealand time as a practical matter because its supply chain runs through Christchurch.)

History of attainment

The history of reaching the geographic North Pole is unusually messy because of the disputed early claims and the difficulty of verifying position without modern navigation.

Frederick Cook (1908). Cook claimed to have reached the pole on 21 April 1908 with two Inughuit companions, returning to civilisation in 1909. His claim has been generally rejected since the original investigation; his navigation records contain serious inconsistencies.

Robert Peary (1909). Peary, with Matthew Henson and four Inughuit companions, claimed to have reached the pole on 6 April 1909. The claim was widely accepted at the time but has been challenged on both navigational and timeline grounds. A 1989 Navigation Foundation analysis concluded Peary likely reached within a few miles of the pole but probably not the pole itself.

Airship Norge (12 May 1926). Roald Amundsen, Umberto Nobile, and Lincoln Ellsworth flew the Italian-built airship Norge from Svalbard across the pole to Alaska. This was the first uncontested visit to the geographic North Pole. The airship Italia under Nobile's command repeated the flight in 1928 but crashed on the return; the disaster ended airship polar travel.

USS Nautilus (3 August 1958). The first transit beneath the pole, the nuclear submarine reaching it submerged under the sea ice.

USS Skate (17 March 1959). The first submarine surfacing at the pole, breaking through the ice cover.

Ralph Plaisted (19 April 1968). The first verified surface trek to the pole, by snowmobile from northern Ellesmere Island.

Wally Herbert (6 April 1969). The first to reach the pole on the surface unaided by motor vehicles, as part of the British Trans-Arctic Expedition's crossing of the Arctic Ocean from Alaska to Svalbard via the pole, on foot and dog sled.

Russian (later Soviet, later Russian again) North Pole drifting ice camps were established intermittently from 1937 (Ivan Papanin's NP-1) until 2015, with stations carried by the drifting sea ice across the central Arctic for periods of months to several years.

Polaris and the precession of pole stars

Above the geographic North Pole, the celestial sphere appears to rotate around the celestial north pole — the point on the sky directly along the extended rotation axis. A star sufficiently close to that point appears nearly stationary as Earth rotates; that star is called a pole star.

Polaris (α Ursae Minoris) is the current pole star. It sits at approximate declination +89°15′51″ — about 0.74° from the celestial pole. Earth's axial precession (the 25,772-year wobble of the rotation axis around the orbital pole) is currently bringing the celestial pole closer to Polaris; Polaris will be at minimum distance around the year 2100, then begin to drift away. By about AD 14,000 the celestial pole will be near Vega; in 3000 BC the pole star was Thuban (α Draconis), close to the celestial pole when the Egyptian pyramids were built. The /learn/celestial-navigation support covers how Polaris is used in latitude determination.

The geographic North Pole and the celestial north pole are not directly related — one is on Earth's surface, the other is on the sky — but the connection is intimate. The altitude of the celestial pole above the horizon equals the observer's latitude; at the geographic North Pole, the celestial pole sits directly overhead at zenith and Polaris is nearly there. This relationship is the foundation of pre-GPS celestial navigation in the Northern Hemisphere.

The 2007 Russian flag

On 2 August 2007 a Russian expedition led by Artur Chilingarov used the Mir-1 and Mir-2 submersibles to descend to the seafloor at the geographic North Pole and plant a titanium Russian flag at 4,261 m depth. The expedition was a public assertion of Russia's claim that the Lomonosov Ridge is a geological extension of the Eurasian continental shelf — a claim that, if accepted under UNCLOS rules, would extend Russia's exclusive economic zone toward or to the pole. Canada and Denmark filed competing claims on the same ridge. The case remains under review by the UN Commission on the Limits of the Continental Shelf.

Sources

• IERS Conventions (TN 36) — IERS Reference Pole and polar motion.
• NOAA NCEI, World Magnetic Model — Magnetic North Pole position.
• NSIDC — Arctic sea ice and ice drift.
• USNO — daylight tables.
• NGA, World Geodetic System 1984 — ellipsoid and reference frame.
• USGS GNIS — geographic-name authority.

For the southern analogue, see /learn/the-south-pole; for the magnetic counterpart, see /learn/the-world-magnetic-model and /learn/magnetic-north-vs-true-north.