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The axial tilt of Earth is approximately 23.439281° [2] with the axis of the plane of the Earth's orbit by definition pointing always towards the Celestial Poles. Due to Earth's axial tilt, the amount of sunlight reaching any given point on the surface varies over the course of the year.
The term "polar wind" was coined [7]: 1937 in 1968 in a pair of articles by Banks and Holzer [8] and by Ian Axford. [9] Since the process by which the ionospheric plasma flows away from the Earth along magnetic field lines, is similar to the flow of solar plasma away from the Sun's corona (the solar wind), Axford suggested the term "polar wind."
The poles also swing in an oval of around 50 miles (80 km) in diameter daily due to solar wind deflecting the magnetic field. [ 3 ] Although the geomagnetic pole is only theoretical and cannot be located directly, it arguably [ weasel words ] is of more practical relevance than the magnetic (dip) pole.
Because the Earth is not a perfect sphere, the length of one minute of arc at the Equator differs from that measured at the geographic poles; thus the modern internationally agreed-upon standard defines the nautical mile as the average of these two extremes: 1,852 metres (6,076 feet; 1.151 miles). [1]
A magnet's North pole is defined as the pole that is attracted by the Earth's North Magnetic Pole, in the arctic region, when the magnet is suspended so it can turn freely. Since opposite poles attract, the North Magnetic Pole of the Earth is really the south pole of its magnetic field (the place where the field is directed downward into the ...
In the Spanish-speaking world, a neighborhood or community within a larger urban area, generally with informal boundaries, though in some places the term may refer to a formal subdivision of a municipality. barrow See tumulus. barysphere The Earth's core and mantle considered together, i.e. all of the Earth's interior beneath the lithosphere ...
Wind shear, sometimes referred to as wind gradient, is a difference in wind speed and direction over a relatively short distance in the Earth's atmosphere. [61] Wind shear can be broken down into vertical and horizontal components, with horizontal wind shear seen across weather fronts and near the coast, [62] and vertical shear typically near ...
For comparison, Earth's Moon is even less elliptical, with a flattening of less than 1/825, while Jupiter is visibly oblate at about 1/15 and one of Saturn's triaxial moons, Telesto, is highly flattened, with f between 1/3 and 1/2 (meaning that the polar diameter is between 50% and 67% of the equatorial.