Kepler's second law of planetary motion states that the orbits of the planets are ellipses with the Sun at one focus.

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Kepler's first law states that the orbits of the planets are ellipses with the Sun at one focus, not his second law. Kepler's second law, also known as the law of equal areas, states that a line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time.

Kepler's Second Law of Planetary Motion States That the Orbits