Assertion: newton's principia | /r/HasProperty | christiaan huygens
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text: Newton had real grounds for claiming in a letter to Halley in June 1686 a “right” to the ellipse, remarking that “Kepler knew the Orb to be not circular but oval, and guest it to be Elliptical” [C, II, 436]. Entirely independently, the most judicious reader of the first edition of the Principia, Christiaan Huygens, wrote the following summary of the Principia‘s achievement in his notebook upon reading the complimentary copy