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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/EL/F1/102" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Copy of a letter, from John Flamsteed to Jean Cassini, dated at Derby</dc:title>
  <dc:description>Discusses methods for determining the diameter of Jupiter and of Mars; discussing the solar parallax; discussing Horrocks's theory and the observations of Hevelius</dc:description>
  <dc:date>September 1673</dc:date>
</rdf:Description>