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In his own words, “I deduced that the forces which keep the planets in their orbs must [be] reciprocally as the squares of their distances from the centers about which they revolve:
It was just proving Kepler's Law of Ellipses using inverse square relationship! Here is the book...sorry, you cannot view external links. To see them, please
REGISTER or LOGINNow I will have to dig it out and read it (add it to the huge pile of reading)