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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/CLP/8i/20a/1" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Manuscript, regarding the orbits of the planets by Nicolas Mercator</dc:title>
  <dc:description>An extract from Nicolas Mercator, 'Hypothesis astronomica nova, et consensus eius cum observationibus' [New hypothesis of astronomy, and with the consent of charges] (London: Ex officina Leybourniana, 1664), where the diagram appears on page 2. By 1670, Mercator had understood Kepler’s area law. 

Subject: Astronomy</dc:description>
  <dc:date>1664</dc:date>
</rdf:Description>