Convertir earth's equatorial radius en mètre

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Vice versa: mètre en earth's equatorial radius

Earth's Equatorial Radius

Earth's equatorial radius is the distance from Earth's center to its surface at the equator, égal à approximativement 6,378.137 km (3,963.19 miles) as defined by the WGS 84 reference ellipsoid. Because Earth is an oblate spheroid, the equatorial radius is the largest radius and is environ 21 km supérieur à the polar radius. Il est a fundamental constant in geodesy, navigation, and geophysical sciences. 


mètre

La metre (Commonwealth spelling and BIPM spelling) or meter (American spelling) (from the French unit mètre, from the Greek noun μετρούν, "measure") is the unité de base de longueur dans le Système international d'unités (SI) (SI). The unité SI symbol is m. Le mètre est défini comme the length of the path travelled by light in a vacuum in 1/299,792,458 of a second.

Le mètre was à l'origine defined in 1793 as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumference is approximativement 40000 km. In 1799, the metre was redefined in terms of a prototype metre bar (the actual bar used was changed in 1889). In 1960, the metre was redefined in terms of a certain number of wavelengths of a certain emission line of krypton-86. In 1983, the current definition a été adopté. 


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