Work C.1.20
Muʾayyad al-Din al-ʿUrḍī
مقدّمة في تصحيح برهان الشكل الرابع من تاسعة المجسطي
Muqaddima fī taṣḥīḥ burhān al-shakl al-rābiʿ min tāsiʿat al-Majisṭī
Alternative title: Muqaddima nāfiʿ fī taṣḥīḥ burhān al-shakl al-rābiʿ min tāsiʿa bi-l-Majisṭī.
This short note provides a correction (taṣḥīḥ) to the geometrical argument related to Proposition 4 in Chapter IX.6 of the Almagest. In most manuscripts the proof is provided with a diagram similar to that in the Almagest, but with the deferent and apsidal line added. For an abbreviated version, which probably goes back to Quṭb al-Dīn al-Shīrāzī or his circle, see C.1.29. For a separate treatise, likewise attributed to al-ʿUrḍi, that complements the present work, see C.1.20a.
Text: [Istanbul, Nuruosmaniye, 2971]
(93v–94r)
Bibl.: GAS VIFuat Sezgin, Geschichte des arabischen Schrifttums, Vol. VI: Astronomie bis ca. 430 H., Leiden: Brill, 1978, p. 94 (no. 31g) and p. 292 (Nachtrag zu S. 94); George Saliba, The Astronomical Work of Muʾayyad al-Dīn al-ʿUrdī. A Thirteenth Century Reform of Ptolemaic Astronomy. Kitāb al-Hay’ah. Edition and Introduction, Beirut: Center for Arab Unity Studies, 1990, p. 31.
Ed.: None.
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