Newton's principia, first book sections I, II, III, with notes and illustrations and a collection of problems, principally intended as examples of Newton's methods (1900)
centre of the ellipse is a third proportional to thediameter through that point and the diameter conjugate to it. Let P be any point In an ellipse, PGG the diameter, DCDconjugate to it, Q any point near P, QB a subtense parallelto CP, QM an ordinate parallel to Z)(7, PV the chord of curva-^ture… … or FV Is a third proportional to FG and BGF). 80. The chord of curvature at any point through tne j ocus isa third proportional to the major axis, and the diameter parallelto the tangent at that point. Draw the focal distance /SP cutting the diameter BCD In E,let FV be the chord of curvature…
Mechanics · Celestial mechanics
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-308-201.webp)
