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QUṬB AL-DĪN AL-SHĪRĀZĪ AND THE DEVELOPMENT OF NON-PTOLEMAIC PLANETARY MODELING IN THE 13th CENTURY

Published online by Cambridge University Press:  17 August 2017

Amir-Mohammad Gamini*
Affiliation:
University of Tehran, Institute for the History of Science, No. 23, Behnam St., Qods St., Enghelab St. P.O Box: 13145-1836 Tehran 1417734491, Iran

Abstract

Coming after Muʾayyad al-Dīn al-ʿUrḍī (1200–1266) and Naṣīr al-Dīn al-Ṭūsī (1201–1274), Quṭb al-Dīn al-Shīrāzī (1236–1311), a leading figure of the so-called Marāgha school in astronomy, presents his predecessors’ non-Ptolemaic models and criticizes them in his three hayʾa books. Since his own new models in Nihāyat al-idrāk (written in Arabic in 1281) and Ikhtiyārāt muẓaffarī (written in Persian in 1282) are not without difficulties, in his latest book on hayʾa, al-Tuḥfa al-shāhiyya (written in Arabic in 1285) he puts forward his modified models inspired from Ṭūsī’s and ʿUrḍī’s models and produces a series of new models for Mercury and the oscillation of the spheres. Nevertheless, in spite of all his attempts, the tradition of non-Ptolemaic modeling after him never converged to a series of standard models.

Résumé

Venu après Muʾayyad al-Dīn al-ʿUrḍī (1200–1266) et Naṣīr al-Dīn al-Ṭūsī (1201–1274), Quṭb al-Dīn al-Shīrāzī (1236–1311), éminente figure de l’école dite de Marāgha en astronomie, présente, dans ses trois ouvrages de hayʾa, les modèles de ses prédécesseurs tout en les critiquant. Puisque ses propres nouveaux modèles, présentés dans Nihāyat al-idrāk (écrit en arabe en 1281) et Ikhtiyārāt muẓaffarī (écrit en persan en 1282), ne sont pas sans difficulté, il présente, dans son dernier ouvrage de hayʾa, al-Tuḥfa al-shāhiyya (écrit en arabe en 1285), d'autres modèles inspirés de ceux d'al-Tūsī et d'al-ʿUrḍī, et produit un ensemble de nouveaux modèles pour Mercure et l'oscillation des sphères. Or, en dépit de tous ces efforts, la tradition des modèles non ptolémaïques, telle qu'elle se développa après lui, ne convergea pas vers un ensemble standard de modèles.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2017 

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