Letter to Edmund Halley on the sun's parallax to the moon and other matters

Author: Isaac Newton

Source: EL/N1/60, Royal Society Library, London, UK

Published online: June 2014

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- Revision History
  - 12 February 2014
    - Transcription by Daniele Cassisa
  - 16 June 2014
    - Code audited by Michael Hawkins
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<60r>

Sir

You'l receive the 2^d Book on Thursday night or Friday by the Coach. I have directed it to be left with M^r Hunt at Gresham Coll. Pray let me beg the favour of a line or two to know of the receipt. I am obliged to you for pushing on the edition because of peoples expectation, thô otherwise I could be as well satisfied to let it rest a year or two longer. Tis a double favour that you are pleased to double your pains about it. D^r Wallis's papers may be long & I would not give you the trouble of transcribing them all. The heads may suffice. The resistence in swift motions is in a duplicate proportion to the celerity. The deduction of the Suns Parallax from the Moons variation I cannot promise now to consider. When Astronomers have examined whether there be such an inequality of her motion in the Quadratures as I mentioned in my last & determined the quantity thereof, I may take some occasion perhaps to tell them the reason. No more at present from

Your most affectionate humble

Servant

Is. Newton.

Cambridge.
March 1^st –8 $\frac{6}{7}$ .

<60v>

For M^r Edmund Halley
to be left with M^r Hunt
in Gresham College in

London.

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Journall-Book R S. n^o. 8.
pag: 132.

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Read Mar 2: 1686.

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