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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/EL/C1/50" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Letter, from Jean Dominique Cassini to Henry Oldenburg, dated at Paris</dc:title>
  <dc: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</dc:description>
  <dc:date>10 June 1669</dc:date>
</rdf:Description>