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 this Matter, does yet further advance in preciseness, as not capable to err half a mioute, though made with Instruments (w) of the Production of Gresham. As to the other Comparison between Kepler and Ptolemee, I question not but all that can judge, will be fully convinced that the Hypothesis of Eccentricks, and Epicycles introduced by the Ancients only to represent the Motions, and that but coursely too; with the Opinion of Ptolemee himself thereon, that the natural Motions were otherwise performed, ought not to be valued against that elegant Theory of the planetary Motions, first invented by the acute Diligence of Kepler, and now lately demonstrated by that excellent Geometer Mr. Newton, ''viz. That all the Planets move in Elliptick Orbs about the Sun, at whose Center, being placed in one Focus of the, they describe equal Area's in equal times; this, as it is the necessary result of the Laws of Motion and Gravity, is also found rigorously to answer to all that is observed in the Motions, so that the Moderns may, with as much Reason as in any other Science whatsoever, value themselves on their having improved, I had almost said perfected, this of Astronomy''.

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