Theories of the Medicean Planets Deduced from Physical Causes

...brought forth, which is surely to wander from the door original: "à ianua... aberrare". Aristotle uses the metaphor of the door in his Metaphysics to describe how some truths are obvious and accessible to everyone, like a doorway that is hard to miss., as Aristotle excellently asserted. Therefore, if I have not discovered the aforementioned wonderful phenomena of the Medicean planets, I have nevertheless judged that it would be not useless, and indeed very pleasant, if I were to show the way to others for thinking correctly about these phenomena. I do this by revealing what motions and relationships the satellites of Jupiter are likely to have, provided that one must reason about them in the same way that nature operates in the other wandering stars stellis erraticis: the planets. Moreover, I have concluded that such relations and habits of motion must be argued from physical necessities, upon which such effects probably depend. Finally, I have shown the various ways and methods by which the aforementioned variations may be found.

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