Born into a Shī`a family with roots in Qum. Sharḥ Taḥrīr al-Majisṭī [1303-6] (commentary on Ṭūsī’s Taḥrīr al-Majisṭī). This included work of observations of the obliquity of the ecliptic,`Urḍī’s (d. 1266) work on instrument construction, work on Venus and Mercury; 1308-9: Kashf-i ḥaqā’iq-i Zīj-i Īlkānī (commentary on Ṭūsī’s Zīj-i Īlkhānī)[BEA, Morrison]