define Kepler's law
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three theorems describing orbital motion. The first law states that planets move in elliptical orbits with the sun at one focus. The second states that the radius vector of a planet sweeps out equal areas in equal times. The third law relates the distances of the planets from the sun to their orbital periods.
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- There are actually three, Kepler’s laws that is, of planetary motion:
- 1) every planet’s orbit is an ellipse with the Sun at a focus.
- 2) a line joining the Sun and a planet sweeps out equal areas in equal times.
- 3) the square of a planet’s orbital period is proportional to the cube of the semi-major axis of its orbit. As it’s the third which is most often used, Kepler’s law usually means Kepler’s third law (of planetary motion).
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