Letter, from Jean Dominique Cassini to Henry Oldenburg, dated at Paris
Reference number: EL/C1/50
Date: 10 June 1669
Description
Cassini states that he has pushed forward the ephemerides of the 'Medicean stars' (Jupiter's moons)
A paper by Nicholas Mercator is attached which considers Cassini's geometrical and direct method for finding the anomalies of the planets. Figures and mathematical formulae are attached
Oldenburg has written a note on the back of the paper about Dr Wren promising Collins the direct method for dividing the area of an ellipse and a table method for finding the length of the ellipse
Mercator's paper originally published by the Journal des Scavans is printed in 'Philosophical Transactions', vol 5, no 57, p 1168
Read to the Royal Society on 16 June 1669
- Reference number
- EL/C1/50
- Earliest possible date
- 10 June 1669
- Page extent
- 23 pages
- Format
- Manuscript
- Also available on Early Modern Letters Online
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Citation
Jean Dominique Cassini, Jean Dominique Cassini, Letter, from Jean Dominique Cassini to Henry Oldenburg, dated at Paris, 10 June 1669, EL/C1/50, The Royal Society Archives, London, https://makingscience.royalsociety.org/items/el_c1_50/letter-from-jean-dominique-cassini-to-henry-oldenburg-dated-at-paris, accessed on 12 February 2026
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Related Publications
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Some considerations of Mr. Nic. Mercator, concerning the geometrick and direct method of signior Cassini for finding the apogees, excentricities, and anomalies of the planets; as that was printed in the Journal des Scavans of Septemb. 2. 1669: which considerations are here delivered in a Latine tongue, wherein they were written by the author, as chiefly regarding the learn'd in astronomy, viz External link, opens in new tab.
Author: Nicolas Mercator
Date: 25th March 1670
DOI: 10.1098/rstl.1670.0018
Hierarchy
This item is part of:
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'Early letters': letters from correspondents in natural philosophy sent to the Royal Society and its Fellows
1613-1740 Reference number: EL -
Related Fellows
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Henry Oldenburg
Recipient -
Jean Dominique Cassini
Author -
Nicolas Mercator
Mentioned
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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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