Question

state keplers law of planetary motion​

Answer 1

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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