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Illustrating the PhaenomenaCelestial cartography in Antiquity and the Middle Ages$
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Elly Dekker

Print publication date: 2012

Print ISBN-13: 9780199609697

Published to Oxford Scholarship Online: January 2013

DOI: 10.1093/acprof:oso/9780199609697.001.0001

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The Mathematical Tradition in Medieval Europe

The Mathematical Tradition in Medieval Europe

(p.337) Chapter Five The Mathematical Tradition in Medieval Europe
Illustrating the Phaenomena

Elly Dekker

Oxford University Press

The oldest extant medieval globe made in the Latin West dates from ca. 1320-1340. It is a precession globe built in keeping with Ptolemy's description and does not fit in any known medieval tradition. The oldest celestial maps in the mathematical tradition were made around 1425 by Conrad of Dyffenbach. His trapezoidal projection appears to be completely new. Another of his maps is based on the polar equidistant projection. This latter projection was also used in ca. 1435 for a pair of celestial maps attributed to Reinardus Gensfelder and closely connected to the Vienna globe making enterprise. The stereographic projection was used for celestial maps other than astrolabes only in the second half of the fifteenth century. The globe by Hans Dorn of 1480 exemplifies the Viennese tradition in globe making. This globe and the other extant celestial globe of 1492 by Johannes Stöffler were designed to help the astrologer to fix the mundane houses. The constellations on Stöffler's globe show the impact of Michael Scot's iconography.

Keywords:   projection, precession, trepidation, celestial maps, globes, precession globe, astrology, Ptolemy, Dyffenbach, Johannes Dorn, Johannes Stöffler, Michael Scot

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