Kepler's second law

1. So, I want to tell you a bit about Kepler's second law of celestial mechanics.
   因此我想告诉你们，一些关于开普勒第二定律的知识。
2. So, what Kepler's second law says is that the motion of planets is, first of all, they move in a plane.
   开普勒第二定律说到，首先每个行星的运动都保持在同一平面内。
3. OK, so, in fact, what Kepler's second law says is that the acceleration is parallel to the position vector.
   所以，开普勒第二定律说，加速度平行于位置矢量。
4. -Kepler's second law is& quite bizarre how he found that out, an amazing accomplishment.
   ，开普勒第二定律-，奇怪他是怎么发现的，惊世的成就。

noun

1. a law concerning the speed at which planets travel
   1. Kepler's second law means that a planet's orbital speed changes with its distance from the sun

   Synonym:    law of areaslaw of equal areas