Letter, from Jean Dominique Cassini to Henry Oldenburg, dated at Paris
Reference number: EL/C1/52
Date: 20 August 1671
Description
Cassini says that he sends a copy of his observations of the sunspots, then gives details of his observations of Saturn, and informs Oldenburg that Monsieur Picard was going to Tycho Brahe's observatory on the island of Hven in the Danish Sound to observe the lunar eclipse and the difference between the meridians and the height of the Pole
Read to the Royal Society on 2 November 1671
- Reference number
- EL/C1/52
- Earliest possible date
- 20 August 1671
- Page extent
- 2 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, 20 August 1671, EL/C1/52, The Royal Society Archives, London, https://makingscience.royalsociety.org/items/el_c1_52/letter-from-jean-dominique-cassini-to-henry-oldenburg-dated-at-paris, accessed on 12 February 2026
Link to this record
https://makingscience.royalsociety.org/items/el_c1_52/letter-from-jean-dominique-cassini-to-henry-oldenburg-dated-at-paris
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Hierarchy
This item is part of:
-
'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
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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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