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- 6,378 km (3,963 mi)Approximating the figure of Earth by an Earth spheroid (an oblate ellipsoid), the radius ranges from a maximum (equatorial radius, denoted a) of nearly 6,378 km (3,963 mi) to a minimum (polar radius, denoted b) of nearly 6,357 km (3,950 mi).en.wikipedia.org/wiki/Earth_radius
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Earth radius - Wikipedia
Earth radius (denoted as R🜨 or RE) is the distance from the center of Earth to a point on or near its surface. Approximating the figure of Earth by an Earth spheroid (an oblate ellipsoid), the radius ranges from a maximum (equatorial radius, denoted a) of nearly 6,378 km (3,963 mi) to a minimum (polar radius, denoted … See more
Earth's rotation, internal density variations, and external tidal forces cause its shape to deviate systematically from a perfect sphere. Local See more
The Earth can be modeled as a sphere in many ways. This section describes the common ways. The various radii derived here use the notation … See more
The following radii are derived from the World Geodetic System 1984 (WGS-84) reference ellipsoid. It is an idealized surface, and the Earth measurements used to calculate it have an uncertainty of ±2 m in both the equatorial and polar dimensions. … See more
Geocentric radius
The geocentric radius is the distance from the Earth's center to a point on the spheroid surface at See moreThe mathematical expressions above apply over the surface of the ellipsoid. The cases below considers Earth's topography, above or below a reference ellipsoid. As such, they are … See more
In astronomy, the International Astronomical Union denotes the nominal equatorial Earth radius as $${\displaystyle {\mathcal {R}}_{e\mathrm {E} }^{\mathrm {N} }}$$, … See more
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WEBThe standard acceleration of gravity for Earth is defined (CODATA 2018) as 9.80665 m/s 2 (exact).
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WEBJul 6, 2021 · According to NASA, Earth's radius at the equator is 3,963 miles (6,378 kilometers), while the radius at the poles is 3,950 miles (6,356 km). Therefore, the diameter of Earth through its...
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WEBFeb 15, 2023 · The actual radius of the earth is 6,378.1 kilometers at the equator, but the radius varies because the earth is a somewhat flattened sphere. The radius is more like 6,371 kilometers at the north and south …
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WEBHis estimate was that the earth had a radius of 6,339.6 km, which is 16.8 km less, also approximately 0.27% off from modern measurements. Robert Helmert In 1906, the German geodesist Friedrich Robert Helmert …
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WEBDec 24, 2015 · If you measure the circumference of the Earth, while passing through the poles, the distance is only 40,007 km. This is because the Earth isn’t a perfect sphere. It’s rotating rapidly, which...
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WEBSep 29, 2020 · The Earth has a radius of 2.439 kilometers / 1.516 miles and a diameter of only 12.742 km / 7.917 mi. When it comes to weight, the mass of Earth is equivalent to 5.9 quadrillion kg. In the Solar System, …
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