Kepler went on to show that an elliptical orbit is sufficient to explain the movement of the other planets and to devise the laws of planetary motion that Newton built on.

接着开普勒证明了这个椭圆轨道也能很有效解释其他行星的运行轨迹。 然后他提出了行星运动定律，牛顿定律就是以此为理论基础的。

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In this book, Newton described universal gravitation and the three laws of motion, which dominated the scientific view of the physical universe for the next three centuries.

在这本书里，牛顿阐述了万有引力和力学三大定律，接下来的三个世纪，这些理论在物理科学领域占据主导地位。

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Newton put forward three laws of motion in the book.

在书中，牛顿提出三个运动定律。

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The law, of course, is not a real law, such as Newton's laws of gravity and motion.

FORBES: THE HUMAN ROLE

Kepler is famous for discovering the three laws of planetary motion, laws which Isaac Newton later re-derived with his universal theory of gravitation.

FORBES: Kepler, Mars and the Turning Point in Astronomy