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  1. Quṭb al-dīn al-shīrāzī and the development of non-ptolemaic planetary modeling in the 13 th century.Amir-Mohammad Gamini - 2017 - Arabic Sciences and Philosophy 27 (2):165-203.
    Coming after Muʾayyad al-Dīn al-ʿUrḍī and Naṣīr al-Dīn al-Ṭūsī, Quṭb al-Dīn al-Shīrāzī, a leading figure of the so-called Marāgha school in astronomy, presents his predecessors’ non-Ptolemaic models and criticizes them in his threehayʾabooks. Since his own new models inNihāyat al-idrāk andIkhtiyārāt muẓaffarī are not without difficulties, in his latest book onhayʾa,al-Tuḥfa al-shāhiyya 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 (...)
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  • The Philosophical Justification for the Equant in Ptolemy’s Almagest.James L. Zainaldin - 2017 - Phronesis 62 (4):417-442.
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  • A forgotten solar model.S. Mohammad Mozaffari - 2016 - Archive for History of Exact Sciences 70 (3):267-291.
    This paper analyses a kinematic model for the solar motion by Quṭb al-Dīn al-Shīrāzī, a thirteenth-century Iranian astronomer at the Marāgha observatory in northwestern Iran. The purpose of this model is to account for the continuous decrease of the obliquity of the ecliptic and the solar eccentricity since the time of Ptolemy. Shīrāzī puts forward different versions of the model in his three major cosmographical works. In the final version, in his Tuḥfa, the mean ecliptic is defined by an eccentric (...)
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