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={Steven Vanden Broecke},
  journal={Annals of Science},
  pages={219 - 240}
  • S. Broecke
  • Published 1 January 2001
  • Physics
  • Annals of Science
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… 
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  • L. Kassell
  • History, Art
    Journal for the History of Knowledge
  • 2021
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    Nuevos Estudios four diOE erent aspects : opposition (planets are 180 Ê apart), trine (120 Ê apart), quartile (90 Ê apart) and sextile (60 Ê apart)
      Studies in the medieval conception of precession ', Archives Internationales d
      • Histoire des Sciences
      • 1976
      Mercator thus follows Alcabitius's order of relative strength, which can also be found in Scho $ ner (note 55), folio F1r
        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
        Science and tradition in the Tetrabiblos
        • Proceedings of the American Philosophical Society
        • 1988
        Mercator refers to the ® xed stars and not to the planets
          The Egyptian division of the terms according to Ptolemy (Tetrabiblos, i , 20) and Alcabitius (note 52)
            Cherton and Watelet (42), 410, mentions`Cl. Ptolomaei opera excepta Geographia cum quibusdam notis marginalibus Gerardi Mercatoris
            • 1987