Dee, Mercator, and Louvain Instrument Making: An Undescribed Astrological Disc by Gerard Mercator (1551)

  title={Dee, Mercator, and Louvain Instrument Making: An Undescribed Astrological Disc by Gerard Mercator (1551)},
  author={S. Broecke},
  journal={Annals of Science},
  pages={219 - 240}
The present paper complements the publications of Gerard L'E. Turner on Mercator's astrolabes by presenting an account of an astrological disc which Mercator published at Louvain in May 1551. This instrument, of which only one copy is known, is described, and a transcription of its instruction sheet, with commentary and English translation, is provided. My preliminary study of the astrological content and context of the instrument indicates that it is connected with John Dee's astrological… Expand
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The clock and the mirror
Science and tradition in the Tetrabiblos
  • Proceedings of the American Philosophical Society
  • 1988
Cherton and Watelet (42), 410, mentions`Cl. Ptolomaei opera excepta Geographia cum quibusdam notis marginalibus Gerardi Mercatoris
  • 1987
Saggio sulla Filoso® a di Cardano
  • 1980
Studies in the medieval conception of precession ', Archives Internationales d
  • Histoire des Sciences
  • 1976
Cardanus's alternative division of the terms in De Iudiciis Geniturarum (see Opera Omnia
    Each planet has one sign in which its power is bene® ted and a diametrically opposite sign in which it is in detriment. This is the subject of Tetrabiblos, i
    • exaltation
    For a study of the astrological information on the horizon ring of the 1551 celestial globe, see Van Gijsen (note 12)
      Many stars on the gores of the 1551 celestial globe indeed have indications of their nature. 62 That is the front plate of the astrological instrument, above which the planetary indexes rotate
        Mercator refers to the ® xed stars and not to the planets