Convertir earth's polar radius en mètre

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Vice versa: mètre en earth's polar radius

Earth's Polar Radius

Earth's polar radius is the distance from Earth's center to either geographic pole, égal à approximativement 6,356.752 km (3,949.90 miles) selon the WGS 84 reference ellipsoid. Il est shorter than the equatorial radius due to Earth's oblate spheroid shape, a flattening caused by the planet's rotation. The difference between the equatorial and polar radii defines Earth's flattening factor, a key parameter in geodesy. 


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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