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Kepler's three laws
First Law: All planets orbit the sun along elliptical orbits of different sizes, and the sun is at a focal point of the ellipse.

The second law: when the planet moves, the straight line connecting the planet and the sun will always sweep the same size area in the same time.

Third Law: The ratio of the cube of the semi-long axis of the elliptical orbit of all planets to the square of period of revolution is equal.