词典释义：
开普勒定律
Then through Kepler's laws of motion, it's possible to calculate the mass of the star.
然后通过议案开普勒定律，它可以计算出恒星的质量。
He would give a book worth 40 shillings to anyone who could deduce Kepler's laws from the inverse-square law.
Christopher Wren打赌如果有人能用平方反比定律推论开普勒定律，他就会将一本价值40先令的书送给这个人。
Today, I will talk to you about elliptical orbits and Kepler's famous laws.
今天我们要讨论，行星轨道，和著名的开普勒定律。
开普勒定律是德国天文学家开普勒提出的关于行星运动的三大定律。 第一和第二定律发表于1609年，是开普勒从天文学家第谷观测火星位置所得资料中总结出来的；第三定律发表于1619年。这三大定律又分别称为椭圆定律、面积定律和调和定律。
three theorems describing orbital motion. The first law states that planets move in elliptical orbits with the sun at one focus. The second states that the radius vector of a planet sweeps out equal areas in equal times. The third law relates the distances of the planets from the sun to their orbital periods.
开普勒定律。