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Kepler's laws of planetary motion
Figure 1: Illustration of Kepler's three laws with two planetary orbits. (1) The orbits are ellipses, with focal points ƒ1 and ƒ2 for the first planet and ƒ1 and ƒ3 for the second planet. The Sun is placed in focal point ƒ1. (2) The two shaded sectors A1 and A2 have the same surface area and the time for planet 1 to cover segment A1 is equal to the time to cover segment A2. (3) The total orbit times for planet 1 and planet 2 have a ratio a13/2 : a23/2. In astronomy, Kepler's laws give a description of the motion of planets around the Sun. Kepler's laws are:#The orbit of every planet is an ellipse with the Sun at one of the two foci.#A line joining a planet and the Sun sweeps out equal areas during equal intervals of time.#The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit. Cite error: There are tags on this page, but the references will not show without a {{Reflist}} template or a tag; see the help page.
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