File:Halley's Letter to Newton About Comets' Orbits (MS Add.3982) (rearranged).jpg

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Author
Edmond Halley (1656–1742)
Description
English: Letter by Edmond Halley to Isaac Newton, dated 28 September 1695, regarding Halley's study of comet's orbits. Digitally rearranged to improve readability.
Português: Carta de Edmond Halley a Isaac Newton, datada de 28 de setembro de 1695, tratando do estudo de Halley da órbita de cometas. Digitalmente rearrumada para melhorar legibilidade.
Date 28 September 1695
date QS:P571,+1695-09-28T00:00:00Z/11
Inscriptions
London Sept 28º 1695

Honoured Sr I have been hard at work to serve you, and having done the Comet of 1683, which I can represent most exactly; and that of 1664, (wherein I find Hevelius has not been able to observe it the exactness requisite,) as near as I conceive it possible; I fell to consider that of 1680/1 which you have described in your book, and looking over your Catalogue of the observed places, I find in that of the 25th of January 1681, that there is a mistake of 20 minutes, xxxx in the Latitude that day, of 56 minutes for 36, and so I have it in a lre* Mr Flamsteed sent me when I was at Paris. I thought fitt to advertise this, because you wrote me you designed to undertake to correct what you had formerly deter_ mined about the Orb thereof; and that day is one of those you have taken to define the orb by. I find certain indication of an Elliptick Orb in that Comet and am satisfied that it will be very difficult to hitt it exactly by a Parabolick. When I have computed all the Observations, I shall send you what I have done. If you have not gotten Vlacq's great Table of Sines and Tangents to 10 Seconds, I believe I can procure ——— it for you, and shall be glad to serve you therein, well knowing how much it will ease you in the Computations you are at⸗ present engaged in; If you still want the book pray lett me know. I must entreat you to procure for me of Mr Flamsteed what he has observed of the Comett of 1682 particularly in the month of September, for I am more and more confirmed that we have seen that Comett now three times, since yͤ Yeare 1531, he will not deny it you, though I know he will me.

I am Sr Your most obedient Servant Edm. Halley

‌
*Acronym for "letter"
Source/Photographer Letter from Edmond Halley to Isaac Newton: "Halley to Newton About Comets' Orbits" (28 September 1695). Available on Cambridge University Library as MS Add.3982/3. High quality obtained via Dezoomify.
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current01:52, 20 December 2023Thumbnail for version as of 01:52, 20 December 20238,181 × 4,771 (17.8 MB)Avelludo (talk | contribs)Uploaded a work by Edmond Halley (1656–1742) from Letter from Edmond Halley to Isaac Newton: "Halley to Newton About Comets' Orbits" (28 September 1695). Available on Cambridge University Library as [http://cudl.lib.cam.ac.uk/view/MS-ADD-03982/3 MS Add.3982/3]. High quality obtained via [https://dezoomify.ophir.dev/ Dezoomify]. with UploadWizard

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