nomicall science; they being nothing else but the necessary consequences of the Sun, Earth, Moon and planets having all of them a gravitation or tendency towards their centers, proportionate to the Quantitie of matter in each of them, and whose force abates in duplicate proportion of the distance reciprocally. Here likewise are indisputably solved the appearances of the Tides or flux and reflux of the sea, and the spheroidicall figure of the Earth and Jupiter determined (from which the precession of the Equinoxe or rotation of the Earths Axis is made out,) together with the retrocession of y<sup>e<\sup> Moons Nodes, the Quantity and inequalities of whose Motion is here exactly stated <u>a priores<\u> Lastly the Theory of the Motions of Comets is attempted with such success, that in an Example of the great Comet which appeared in 1680 the motion therof is computed as exactly as wee can pretend to give the places of the primary planets, and a generall method is here laid down to state and determine the Trajectorie of Comets by an easy Geometricall construction, upon supposition that these curves are parabolick or so near it, that the parabola may serve without sen sible errour; tho it be more probable saith our author that those orbs are Ellipticall, and that after long periods <s>they <\s> Comets may return again. but such Ellipses are, by reason of the immense distance of the Foci and smallness of the Latus rectum, in the parts near y<sup>e<\sup> Sunn where Comets appear, not <s>to be<\s> easily distinguished from the <s>motion <\s> Curve of a parabola, as is proved by the Example produced. The whole book is interspersed with Lemmas of Generall use in Geome try, and severall new methods applyed which <s>may be <\s> are well worth the considering and it may be justly said so many and so <s>great<\s> valuable Philosophicall truths as are herein discovered and put past dispute; were never yet owing to the sagacity and industry of any one Man.
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