Radius of the earth in metres

The symbol R?

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.

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 , 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. A few definitions yield values outside the range between polar radius and equatorial radius because they include local or geoidal topography or because they depend on abstract geometrical that are carefully thought about. Contents move to sidebar hide. Page Talk. Read Change Change source View history. Tools Tools. In other projects. Wikimedia Commons. The English used in this article or section may not be easy for everybody to understand.

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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. Eratosthenes used Aristotle's idea that, if the Earth was round, distant stars in the night sky would appear at different positions to observers at different latitudes. Eratosthenes knew that on the first day of summer, the Sun passed directly overhead at Syene, Egypt. At midday of the same day, he measured the angular displacement of the Sun from overhead at the city of Alexandria - stadia away from Syene. He found that the angular displacement was 7. Thus the circumference can be estimated by multiplying the distance between the two cities, stadia, by 50, equaling , stadia. How do we convert to kilometers?

Radius of the earth in metres

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.

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Open Mobile Search. Earth's Equatorial Radius to Finger cloth. March Furthermore, in astronomy and geophysics, a nominal radius of earth is sometimes employed as a unit of measurement. The radius of the Earth is 6, kilometres at the poles and 6, kilometres at the equator. See also: Authalic latitude. Earth's Equatorial Radius to Electron Radius classical. May Leave a comment. Examples collapse all Earth Radius in Meters. Earth's Equatorial Radius to Gigameter. Earth's Equatorial Radius to Bohr Radius. The English used in this article or section may not be easy for everybody to understand.

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

European Terrestrial Ref. Units of length used in Astronomy. Earth's Equatorial Radius to Fingerbreadth. Bibcode : JGeod.. Choose a web site to get translated content where available and see local events and offers. The value for the polar radius in this section has been rounded to the nearest 0. See also Cosmic distance ladder Orders of magnitude length Conversion of units. Earth's Equatorial Radius to Centimeter. Earth's Equatorial Radius to Roman Actus. 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 Washington D. 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. A globally-average value is usually considered to be 6, kilometres 3, mi with a 0. Main Content.