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1: Planets travel in an ellipse |  |
2: A line drawn from the sun to a planet sweeps out equal areas in equal times.
Area A= Area B
Time A= Time B
*Note* The closer to the sun or a planet you are, the faster you go. |  |
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3: P^2= A^3
P= Period of revolution around the sun (in years)
A= Semimajor axis in AU (or avg. distance to sun in AU)
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