天文单位[Astronomical Unit] - 达人(其实～我是卧底，来自外星)

2005/06/16 | 天文单位[Astronomical Unit]
类别(¤〖天文〗) | 评论(0) | 阅读(43) | 发表于 21:47: The semimajor axis of the Earth's orbit around the Sun at one particular epoch (I believe the year 1900), equal to m according to the International Astronomical Union 1976 System of Astronomical Constants. It is technically defined as the radius of a circular orbit around the Sun followed by a hypothetical massless particle possessing an orbital period of days, where is the Gaussian gravitational constant.; 0