Radius of the earth in metres

Please provide values below to convert Earth's equatorial radius to meter [m], or vice versa.

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.

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.

Physics of the Earth and Planetary Interiors. Eratosthenes was the first person to calculate the. Since the estimate by Eratosthenesmany models have been created.

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.

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.

Radius of the earth in metres

Earth Radius by Latitude Calculator — Calculates radius and diameter of the Earth for a given latitude. Earth radius at sea level is It is The height above sea level of the location is added. Please enter the latitude in decimal degrees, here you can convert coordinates.

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One can only adopt an idealized model. For Earth, the arithmetic mean radius is 6, A sphere being a gross approximation of the spheroid, which itself is an approximation of the geoid, units are given here in kilometers rather than the millimeter resolution appropriate for geodesy. When identifying the position of an observable location, the use of more precise values for WGS radii may not yield a corresponding improvement in accuracy. Cross section of Earth's Interior. Cancel reply Your email address will not be published. Since the estimate by Eratosthenes , many models have been created. Historically, these models were based on regional topography, giving the best reference ellipsoid for the area under survey. Journal of Geodesy. Astronomical system of units. You can specify any length unit accepted by the validateLengthUnit function. Do you want to open this example with your edits?

The crew of Apollo 17 took this photograph of Earth in December while their spacecraft was traveling between the Earth and the Moon.

Retrieved 18 November The English used in this article or section may not be easy for everybody to understand. Standards history. Earth's diameter is simply twice Earth's radius; for example, equatorial diameter 2 a and polar diameter 2 b. Early astronomy. A sphere being a gross approximation of the spheroid, which itself is an approximation of the geoid, units are given here in kilometers rather than the millimeter resolution appropriate for geodesy. Version History Introduced in Rb. Retrieved Earth's Equatorial Radius to Russian Archin. His highly influential work, the Almagest , [28] left no doubt among medieval scholars that Earth is spherical, but they were wrong about its size. Earth's Equatorial Radius to Attometer. Eratosthenes was the first person to calculate the radius of the earth by comparing the difference in the angle of the sun's rays at different geographic points during the 3rd century B. Earth's Equatorial Radius to Cubit Greek. As satellite remote sensing and especially the Global Positioning System gained importance, true global models were developed which, while not as accurate for regional work, best approximate the Earth as a whole.