Convertir rayon du soleil en mètre

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Rayon du soleil

La solar radius (R) is the standard unit expressing the size of stars relatif à the Sun, défini comme 695,700 km (approximativement 432,288 miles or environ 109 times Earth's radius). Il est formally défini comme the distance from the Sun's center to the point où the optical depth est égal à 2/3, corresponding to the visible photosphere. The solar radius is a key parameter in stellar astronomy and astrophysics. 


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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