Kepler's First Law: The orbit of a planet is an ellipse with the san at one of the two foci
Kepler's Second Law: A line segment joining a planet and the sun sweeps out equal areas during the same time interval
Kepler's Third Law: The square of the orbital period, T, of a planet is directly proportional to the cube of its average distance r from the sun
T² ∝ r³
Modeling Planetary orbits as circles
centripetal force = gravitational force on planet
mv² / r = GMm / r²
v² = GM / r
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