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2012

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cc-by-nc-nd (c) Casulleras Closa, Josep et al., 2012
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/113130

Progressions, Rays and Houses in Medieval Islamic Astrology: A Mathematical Classification

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Abstract

Medieval Islamic mathematicians and astronomers developed a variety of mathematical definitions and computations of the three astrological concepts of houses, rays (or aspects) and progressions. The medieval systems for the astrological houses have been classified by J.D. North and E.S. Kennedy, and the purpose of our paper is to attempt a similar classification for rays and progressions, on the basis of medieval Islamic astronomical handbooks and instruments. It turns out that there were at least six different systems for progressions, and no less than nine different systems for rays. We will investigate the historical relationships between these systems and we will also discuss the authors to whom the systems are attributed in the medieval Islamic sources.

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Astrologia àrab, Classificació, Matemàtica

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Arab astrology, Classification, Mathematics

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Articles publicats en revistes (Filologia Clàssica, Romànica i Semítica)

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CASULLERAS CLOSA, Josep and HOGENDIJK, Jan P. Progressions, Rays and Houses in Medieval Islamic Astrology: A Mathematical Classification. Suhayl. Journal for the History of the Exact and Natural Sciences in Islam. 2012. Vol. 33-102. ISSN 1576-9372. [consulted: 19 of August of 2026]. Available at: https://hdl.handle.net/2445/113130

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