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![]() ![]() ![]() And his defense of the certainty of mathematics, and of astrology within the mathematical sciences. Also, the dialogue at the end of the work, where he discussed the role of authorities in a discipline, and his decisions when writing the commentary. First, his insertion of the fourteen Questions on the Sphere of Pierre d’Ailly (1351–1420) to complement his own comments and his additions to some of the subjects treated in the text, such as the definitions of the sphere, the number of celestial spheres, or the rise and setting of the signs. Many aspects of Ciruelo’s commentary on the Sphaera are of interest. There he was trained at the faculty of arts in the quadrivium, particularly in astrology, as well as in moral and natural philosophy and metaphysics, while teaching disciplines of the trivium simultaneously. Ciruelo had arrived in Paris in 1492, after having spent 10 years at the University of Salamanca. At that time, he was in Paris, teaching mathematics and studying theology at the University of Paris. 1256) Tractatus de sphaera, Uberrimum Sphere mundi commentum, in 1498 (Ciruelo 1498). 1470–1548) published his commentary on Johannes de Sacrobosco’s (died ca. The Spanish scholar Pedro Sánchez Ciruelo (ca. The research for this article was funded by the 2016–1017 Fellowship Programme of the Herzog August Bibliothek (Wolfenbüttel) and by the Mellon Fellowship (2014–2015) at Villa I Tatti, The Harvard University Center for Italian Renaissance Studies. ![]()
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