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Kepler’s Laws of Planetary Motion
1. The Law of Ellipses: All planets move in elliptical orbits, with the sun at one focus.
2. The Law of Equal Areas: A line that connects a planet to the sun sweeps out equal areas in equal times.
3. The Law of Harmonies: The square of the period of any planet is proportional to the cube of the semimajor axis of its orbit.