Planetary Latitudes, the Theorica Gerardi, and Regiomontanus
- C. Kren
- PhysicsIsis
- 1 June 1977
I N 1475, A YEAR before his untimely death in Rome, Regiomontanus published an interesting work, his Disputationem Ioannis de Monteregio contra Cremonensis in planetarum theoricam deliramenta.' The…
Alchemy in Europe: A Guide to Research
- C. Kren
- Art, History
- 1990
Introduction. The Bibliography 1. Research Aids 2. General Works 3. Early Alchemy 4. Medieval Alchemy 5. Alchemy in the Renaissance 6. Alchemy in Early Modern Europe (17th - 18th Centuries) 7.…
The Traveler's Dial in the Late Middle Ages: The Chilinder
- C. Kren
- History
- 1 July 1977
That portable altitude sundials, instruments small enough to be carried about readily, were known in antiquity is verified by a passage in the De architectura of Vitruvius,l who mentions "hanging…
Thomas Harriot: Renaissance Scientist
- C. Kren, J. Shirley
- Engineering, Sociology
- 1 July 1975
Homocentric Astronomy in the Latin West. The De reprobatione ecentricorum et epiciclorum of Henry of Hesse
- C. Kren
- PhysicsIsis
- 1 October 1968
N THE COURSE of his commentary on Book XII of the Metaphysica Averroes (d. 1198), in a famous passage, tells us that in his youth he had hoped to construct an alternative astronomical system to that…
Nichole Oresme and the Kinematics of Circular Motion: Tractatus de commensurabilitate vel incommensurabilitate motuum celi
- C. Kren, Edward J. Grant
- Philosophy
- 1 April 1973
The Rolling Device of Naṣir al-Dīn al-Ṭūsī in the De spera of Nicole Oresme?
- C. Kren
- EducationIsis
- 1 December 1971
DURING HIS CAREER AT PARIS the French Schoolman Nicole Oresme wrote a series of questiones or problems on the popular and influential De spera of Sacrobosco.1 In the final questio (No. 13), which…
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