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Heuristic reasoning: Approximation Procedures in Levi ben Gersons Astronomy

Archive for History of Exact Sciences 52 (1):13-50 (1998)

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(1 other version)Questions of Methodology in Aristotle’s Zoology: A Medieval Perspective. [REVIEW]Ahuva Gaziel - 2012 - Journal of the History of Biology 45 (2):329 - 352.details During the Middle Ages Aristotle's treatises were accessible to intellectuals via translations and commentaries. Among his works on natural philosophy, the zoological books received relatively little scholarly attention, though several medieval commentators carefully studied Aristotle's investigations of the animal kingdom. Averroes completed in 1169 a commentary on an Arabic translation of Aristotle's Parts of Animals and Generation of Animals. In 1323 Gersonides completed his supercommentary on a Hebrew translation of Averroes' commentary. This article examines how these two medieval commentators interpret (...) Download Export citation Bookmark
Holding or Breaking with Ptolemy's Generalization: Considerations about the Motion of the Planetary Apsidal Lines in Medieval Islamic Astronomy.S. Mohammad Mozaffari - 2017 - Science in Context 30 (1):1-32.details ArgumentIn theAlmagest, Ptolemy finds that the apogee of Mercury moves progressively at a speed equal to his value for the rate of precession, namely one degree per century, in the tropical reference system of the ecliptic coordinates. He generalizes this to the other planets, so that the motions of the apogees of all five planets are assumed to be equal, while the solar apsidal line is taken to be fixed. In medieval Islamic astronomy, one change in this general proposition took (...) Download Export citation Bookmark 2 citations
Levi ben Gerson's Astronomical Work: Chronology and Christian Context.J. L. Mancha - 1997 - Science in Context 10 (3):471-493.details The ArgumentLevi ben Gerson, also known as Gersonides or Leo de Balneolis, was one of the most original Jewish thinkers of the Middle Ages, and he wrote on logic, philosophy, biblical exegesis, mathematics, and astronomy. During the last years of his life he maintained relations with the papal court of Clement VI (1342–52) at Avignon, and collaborated in the translation into Latin of hisSefer Tekhuna(Book of Astronomy). The object of this paper is to establish the main stages of the redaction (...) Download Export citation Bookmark 2 citations
John Holbroke, the Tables of Cambridge, and the “true length of the year”: a forgotten episode in fifteenth-century astronomy.C. Philipp E. Nothaft - 2018 - Archive for History of Exact Sciences 72 (1):63-88.details This article examines an unstudied set of astronomical tables for the meridian of Cambridge, also known as the Opus secundum, which the English theologian and astronomer John Holbroke, Master of Peterhouse, composed in 1433. These tables stand out from other late medieval adaptations of the Alfonsine Tables in using a different set of parameters for planetary mean motions, which Holbroke can be shown to have derived from a tropical year of $$365\frac{1}{4} - \frac{1}{132}$$ 36514-1132 or $$365.\overline{24}$$ 365.24¯ days. Implicit in (...) Download Export citation Bookmark 1 citation

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