Ioannis Keppleri Harmonices mundi libri V

Kepler, Johannes; Ptolemy; Fludd, Robert
sumptibus Godofredi Tampachii ..., excudebat Ioannes Plancus, 1619
6. Third Law In this work, Kepler was able to announce his third law of planetary motion, that the square of the orbital period of a planet is equal to the cube of its mean distance from the Sun.
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6. Third Law

In this work, Kepler was able to announce his third law of planetary motion, that the square of the orbital period of a planet is equal to the cube of its mean distance from the Sun.