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Letter, from Jean Dominique Cassini [to the Royal Society]

Reference number: EL/C1/49

Date: 14 February 1665

Description

Autograph letter
Cassini discusses Auzout's hypothesis for the comet's motion
A paper (in Latin) by Cassini is enclosed which provides his own observations of the recent comet in December 1664
There are marginal notes in another hand
Oldenburg endorsed the letter: 'An extract of a letter by Signor Cassini to a person of quality and communicated by Monsieur Auzout for the R Society'
Read to the Royal Society on 15 March 1665

Reference number
EL/C1/49
Earliest possible date
14 February 1665
Page extent
5 pages
Format
Manuscript

Creator names

Jean Dominique Cassini

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Jean Dominique Cassini

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Citation

Jean Dominique Cassini, Jean Dominique Cassini, Letter, from Jean Dominique Cassini [to the Royal Society], 14 February 1665, EL/C1/49, The Royal Society Archives, London, https://makingscience.royalsociety.org/items/el_c1_49/letter-from-jean-dominique-cassini-to-the-royal-society, accessed on 22 April 2026

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  • Early Letters

    The archival collection known as 'Early Letters' is composed of original manuscript letters sent to, or collected by, the Royal Society from English and foreign correspondents.

    Dates: 1613 - 1740

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