how did keplars laws help Newton to arrive at the inverse square law of gravity??
[and state Kepler's laws] (optional)
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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; and 3) the square of a planet's orbital period is proportional to the cube of the semi-major axis of its ...
The Newton's inverse square law is deduced from Kepler's 'Third law' of planetary motion. Kepler saw that planets move around in an elliptical orbit. From this the square inverse nature of gravitational force was derived by Newton.
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