Radius of the earth in metres

Please provide values below to convert Earth's equatorial radius to meter [m], or vice versa. From: Earth's equatorial radius To: meter. Earth's Equatorial Radius to Kilometer.

The symbol R? The radius of our planet, The Earth, is the distance from the centre of the Earth to a point on or near its surface, and it ranges from nearly 6, km to nearly 6, km, approximating the figure of Earth by an Earth spheroid. Furthermore, in astronomy and geophysics, a nominal radius of earth is sometimes employed as a unit of measurement. The radius of curvature is another approach to define and measure the Earth radius, and some definitions produce results that are outside the range between polar and equatorial radius because they include local or geoidal topography. Another reason could be that they are based on abstract geometrical ideas.

Radius of the earth in metres

Approximating the figure of Earth by an Earth spheroid , the radius ranges from a maximum of nearly 6, km 3, mi equatorial radius , denoted a to a minimum of nearly 6, km 3, mi polar radius , denoted b. A nominal Earth radius is sometimes used as a unit of measurement in astronomy and geophysics , which is recommended by the International Astronomical Union to be the equatorial value. A globally-average value is usually considered to be 6, kilometres 3, mi with a 0. The International Union of Geodesy and Geophysics IUGG provides three reference values: the mean radius R 1 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 R 2 ; and the volumetric radius , which is the radius of a sphere having the same volume as the ellipsoid R 3. Other ways to define and measure the Earth's radius involve the radius of curvature. A few definitions yield values outside the range between the polar radius and equatorial radius because they include local or geoidal topography or because they depend on abstract geometrical considerations. Earth's rotation , internal density variations, and external tidal forces cause its shape to deviate systematically from a perfect sphere. Our descriptions of Earth's surface must be simpler than reality in order to be tractable. Hence, we create models to approximate characteristics of Earth's surface, generally relying on the simplest model that suits the need. Each of the models in common use involve some notion of the geometric radius. Strictly speaking, spheres are the only solids to have radii, but broader uses of the term radius are common in many fields, including those dealing with models of Earth. The following is a partial list of models of Earth's surface, ordered from exact to more approximate:. In the case of the geoid and ellipsoids, the fixed distance from any point on the model to the specified center is called "a radius of the Earth" or "the radius of the Earth at that point". When considering the Earth's real surface, on the other hand, it is uncommon to refer to a "radius", since there is generally no practical need.

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Approximating the figure of Earth by an Earth spheroid , the radius ranges from a maximum of nearly 6, km 3, mi equatorial radius , represented a to a minimum of nearly 6, km 3, mi polar radius , represented b. Earth radius is sometimes used as a unit of measurement in astronomy and geophysics. The International Astronomical Union recommends that the radius at the equator should be used. A globally-average value is usually believed to be 6, kilometres 3, mi with a 0. The International Union of Geodesy and Geophysics IUGG provides three reference values: the mean radius R 1 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 R 2 ; and the volumetric radius , which is the radius of a sphere having the same volume as the ellipsoid R 3. All three values are about 6, kilometres 3, mi. Other ways to define and measure the Earth radius involve the radius of curvature.

The calculator below calculates Earth radius at a given latitude. In fact, of course, it calculates the radius of WGS 84 reference ellipsoid at a given latitude, and if you want some theory recap, you can find it below the calculator. Since the Earth is flattened at the poles and bulges at the equator, geodesy represents Earth's shape with an oblate spheroid. The oblate spheroid, or oblate ellipsoid, is an ellipsoid of revolution obtained by rotating an ellipse about its shorter axis. It is the regular geometric shape that most nearly approximates the shape of the Earth. A spheroid describing the Earth's figure or other celestial body is called a reference ellipsoid. The reference ellipsoid for Earth is called an Earth ellipsoid. Earth's physical surface is irregular. It can be approximated by the geoid , which was an important concept for almost two hundred years of history of geodesy and geophysics.

Radius of the earth in metres

The crew of Apollo 17 took this photograph of Earth in December while their spacecraft was traveling between the Earth and the Moon. The orange-red deserts of Africa and Saudi Arabia stand in stark contrast to the deep blue of the oceans and the white of both clouds and snow-covered Antarctica. In B.

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Wikimedia Commons. The symbol R? Gravitational attraction from the Moon or Sun can cause the Earth's surface at a given point to vary by tenths of a meter over a nearly hour period see Earth tide. Earth's Equatorial Radius to Millimeter. Hidden categories: Webarchive template wayback links All articles with dead external links Articles with dead external links from February Articles with permanently dead external links CS1: long volume value Wikipedia articles incorporating a citation from the Encyclopaedia Britannica with Wikisource reference CS1 French-language sources fr Articles with short description Short description is different from Wikidata Wikipedia articles needing clarification from April All articles with unsourced statements Articles with unsourced statements from September Articles with unsourced statements from November Archived from the original on Ordnance Survey Great Britain Contents move to sidebar hide. The value for the equatorial radius is defined to the nearest 0. Approximating the figure of Earth by an Earth spheroid , the radius ranges from a maximum of nearly 6, km 3, mi equatorial radius , denoted a to a minimum of nearly 6, km 3, mi polar radius , denoted b.

Earth Radius by Latitude Calculator — Calculates radius and diameter of the Earth for a given latitude. Earth radius at sea level is It is

Archived from the original on Earth's Equatorial Radius to Hectometer. Get all your queries solved in one single place. ISBN X. While specific values differ, the concepts in this article generalize to any major planet. Page Talk. Retrieved 5 November Hence, the Earth deviates from a perfect sphere by only a third of a percent, which supports the spherical model in most contexts and justifies the term "radius of the Earth". The principal curvatures are the roots of Equation in: [13]. Geodesy Geodynamics Geomatics History. The symbol R? This requires an elliptic integral to find, given the polar and equatorial radii:. For the WGS84 ellipsoid, that's respectively:.