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  1. Solar and lunar observations at Istanbul in the 1570s.John M. Steele & S. Mohammad Mozaffari - 2015 - Archive for History of Exact Sciences 69 (4):343-362.
    From the early ninth century until about eight centuries later, the Middle East witnessed a series of both simple and systematic astronomical observations for the purpose of testing contemporary astronomical tables and deriving the fundamental solar, lunar, and planetary parameters. Of them, the extensive observations of lunar eclipses available before 1000 AD for testing the ephemeredes computed from the astronomical tables are in a relatively sharp contrast to the twelve lunar observations that are pertained to the four extant accounts of (...)
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  • A mechanical concentric solar model in Khāzinī’s Mu‘tabar zīj.S. Mohammad Mozaffari - 2022 - Archive for History of Exact Sciences 76 (5):513-529.
    The paper brings into light and discusses a concentric solar model briefly described in Chapter 5 of Section III of ‘Abd al-Raḥmān al-Khāzinī’s On experimental astronomy, a treatise embedded in the prolegomenon of his comprehensive Mu‘tabar zīj, completed about 1121 c.e. In it, the Sun is assumed to rotate on the circumference of a circle concentric with the Earth and coplanar with the ecliptic, but the motion of the vector joining the Earth and Sun is monitored by a small eccentric (...)
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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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  • An analysis of medieval solar theories.S. Mohammad Mozaffari - 2018 - Archive for History of Exact Sciences 72 (2):191-243.
    From Antiquity through the early modern period, the apparent motion of the Sun in longitude was simulated by the eccentric model set forth in Ptolemy’s Almagest III, with the fundamental parameters including the two orbital elements, the eccentricity e and the longitude of the apogee λ A, the mean motion ω, and the radix of the mean longitude $$ \bar{\lambda }_{0} $$ λ¯0. In this article we investigate the accuracy of 11 solar theories established across the Middle East from 800 (...)
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