Credit: ©The Royal Society
    Image number: RS.15497

    Elliptical orbit of planets

    Date
    1664
    Creator
    Unknown, Artist
    Object type
    Archive reference number
    Manuscript page number
    p1
    Material
    Dimensions
    height (page): 300mm
    width (page): 197mm
    Subject
    Description
    Diagram and chart from Nicolas Mercator, Hypothesis astronomica nova, et consensus eius cum observationibus (London: Ex officina Leybourniana, 1664), where the diagram appears at p. 2. The diagram shows how a non-uniform motion of a planet in an elliptical orbit might be reduced to equal angles in equal times around the empty focus (F). By 1670, Mercator had understood Kepler’s area law.

    Another version of this diagram can be found at Cl.P/8i/20a/003.
    Object history
    Diagram and chart from Nicolas Mercator, Hypothesis astronomica nova, et consensus eius cum observationibus (London: Ex officina Leybourniana, 1664), p. 2
    Related fellows
    Nicolas Mercator (1614 - 2001, British) , Mathematician
    Associated place
    <The World>
       > Europe
          > United Kingdom
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