"The focal radius joining a planet to the sun sweeps out equal areas in equal times."

II. The line joining the planet to the Sun sweeps out equal areas in equal times as the planet travels around the ellipse.

Attraction (click to enlarge)

See Also

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Kepler Kepler Music of the Spheres Kepler Music Theory Kepler Theory of Harmony Kepler's First Law Kepler's Third Law Propositions of Astronomy