High Quality Content by WIKIPEDIA articles! Isaac Newton composed Principia Mathematica during 1685 and 1686.In the other letters written in 1685 and 1686, he asks Flamsteed for information about the orbits of the moons of Jupiter and Saturn, the rise and fall of the spring and neap tides at the solstices and the equinoxes, about the flattening of Jupiter at the poles (which, if certain, he says, would conduce much to the stating the reasons of the precession of the equinoxes), and about the universal application of Kepler's third law. "Your information for Jupiter and Saturn has eased me of several scruples. I was apt to suspect there might be some cause or other unknown to me which might disturb the sesquialtera proportion.

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