Earth radius
Distance from the Earth surface to a point near its center
Earth radius
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 about 6378 km (3963 mi) to a minimum (polar radius, denoted b) of nearly 6357 km (3950 mi). The globally averaged value is 6371 kilometres (3959 mi) with a 0.3% variability (±10 km) for the following reasons. The International Union of Geodesy and Geophysics (IUGG) provides three reference values: the mean radius (R1) of three radii measured at two equator points and a pole; the authalic radius, which is the radius of a sphere with the same surface area (R2); and the volumetric radius, which is the radius of a sphere having the same volume as the ellipsoid (R3). All three values are about 6371 kilometres (3959 mi). Other ways to define and measure the Earth's radius involve either the spheroid's radius of curvature or the actual topography...
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