Kepler's Laws from ASTR 201 flashcards

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Front (Question)

Kepler's Laws

Back (Answer)

Each planet's orbit around the Sun is an ellipse, with the Sun at one focus
A planet moves along its orbit with a speed that changes in such a way that a line from the planet to the Sun sweeps out equal areas in equal intervals of time.
The ratio of the cube of a planet's average distance from the Sun to the square of its orbital period is the same for each planet.

a3 / P2 = 1

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