The Importance of the Transit of Mercury of 1631

  title={The Importance of the Transit of Mercury of 1631},
  author={A. van helden},
  journal={Journal for the History of Astronomy},
  pages={1 - 10}
When the historian of astronomy writes about the historical importance of transits of Venus and Mercury across the Sun, it is usually with reference to the internationally coordinated observations of the eighteenth century, designed to produce an accurate measure of solar parallax.' Often their effects on the accuracy of the tables of Venus and Mercury are also discussed." The first transit ever observed, however, that of Mercury of 1631, was important for an entirely different reason: it… Expand

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Hafenreffer (Tuebingen, 1606), thesis 98. See also Gesammelte werke
  • 's somnium
  • 1967
See also Willy Hartner's discussion of these measurements and calculations in "Medieval Views on Cosmic Dimensions and Ptolemy's Kitalo al-Manshurat
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History ofphysical astronomy (London, 1852),212; Antoni Pannekoek, A history of astronomy
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Hludovici Pii, per annos continuos lxxxvii
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500. 29. Ibid., 500-1. 30. Ibid., 501. 31. Ibid., 501. 32. Ibid
    Except in the case of Venus whose apparent diameter at perigee was given by Riccioli as 4'8". Hortensius's values were also reported by Pierre Herigone in his Cursus mathematicus
      Gesammelte werke, iv
        Institutio astronomica (Paris, 1647) in Opera omnia