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The Laws of Planetary Motion Kepler's First Law: The orbits of the planets are ellipses, with the Sun at one focus of the ellipse. 行星沿椭圆轨道绕太阳运行，太阳位于椭圆的一个焦点上。 对任一个行星说，它的径矢在相等的时间内扫过相等的面积。