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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. 行星沿橢圓軌道繞太陽運行，太陽位於橢圓的一個焦點上。 對任一個行星說，它的逕矢在相等的時間內掃過相等的麪積。