| Each planet revolves so that the radius vector, sun to earth, sweeps out equal area in equal intervals of time |
| The area swept out by the radius vector of each planet, sun to earth, per hour, increasing with increasing length of the radius vector |
| Each planet moves in an elliptical orbit with the Sun at one focus. |
| The square of the orbital period is proportional to the cube of the semi-major axis. |
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