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1·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。

2·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。

3·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。