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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Robert H. van Gent
Date: 2024 Nov 28, 09:13 -0800
Hi,
Other high-resolution scans of Jacques Cassini's world map can be found on the Gallica website
https://gallica.bnf.fr/ark:/12148/btv1b53052904n
https://gallica.bnf.fr/ark:/12148/btv1b53093234t
These can be downloaded at maximum resolution by pasting the url in https://dezoomify.ophir.dev/
The role of Cassini and other astronomers in popularizing this method for determining longitude (on land, of course) is discussed in this paper:
- Albert Van Helden, "Longitude and the Satellites of Jupiter", in: W.J. Andrewes (ed.), The Quest for Longitude: The Proceedings of the Longitude Symposium, Harvard University, Cambridge, Massachusetts, November 4-6, 1993 (Cambridge [MA]: Collection of Historical Scientific Instruments Harvard University, 1996), pp. 86-100
online here
https://archive.org/details/questforlongitud0000long
A similar and more detailed world map, engraved between 1720 and 1722, by Johann Gabriel Doppelmayr and online here
https://gallica.bnf.fr/ark:/12148/btv1b53052960b
https://gallica.bnf.fr/ark:/12148/btv1b8592310t
https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~283684~90056200
depicts more locations as it also adds those with longitudes determined from lunar and solar eclipses
Rob van Gent
