After some treatment of centripetal force, he deduces Kepler's third law.
在向心力的一些论述之后，他推出了开普勒的第三定律。
Kepler's third law gave a more specific hint about the nature of the force.
开普勒第三定律给出了一个关于力的本质的更为具体的说明。
Let us test Kepler's third law for the orbit of Uranus compared with that of earth.
让我们比较天王星和地球的轨道，来检验一下开普勒第三定律。
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