Radius of the earth in metres

Approximating the figure of Earth by an Earth spheroidthe radius ranges from a maximum of nearly 6, km 3, mi equatorial radiusdenoted a to a minimum of nearly 6, km 3, mi polar radiusdenoted b. A nominal Earth radius is sometimes used as a unit of measurement in astronomy and geophysicswhich is recommended by the International Astronomical Union to be the equatorial value.

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. Earth's Equatorial Radius to Decimeter. Earth's Equatorial Radius to Centimeter. Earth's Equatorial Radius to Millimeter.

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.

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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.

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.

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. 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? Well, we believe that the unit of the "stadium" was about 0.

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Mechanics of Flight. Follow us on. Retrieved Main articles: Figure of the Earth , Earth ellipsoid , and Reference ellipsoid. When measured from the poles, it has a different diameter than when measured at the equator. Earth's Equatorial Radius to Dekameter. Help Center Help Center. Retrieved 5 November The expedition found that Newton's conjecture was correct: [32] the Earth is flattened at the poles due to rotation's centrifugal force. This topographical average is 6, Houghton Mifflin Harcourt. Units of length used in Astronomy.

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

Earth's Equatorial Radius to Gigameter. Earth's Equatorial Radius to League statute. Earth's Equatorial Radius to Dekameter. Not to be confused with Geocentric distance. 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. Additionally, the radius can be estimated from the curvature of the Earth at a point. Historically, these models were based on regional topography, giving the best reference ellipsoid for the area under survey. Contents move to sidebar hide. The value for the equatorial radius is defined to the nearest 0. The geoid height can change abruptly due to earthquakes such as the Sumatra-Andaman earthquake or reduction in ice masses such as Greenland.