Aceph. copy of a commentary on al-Tadhkirah al-Naṣīrīyah, a work on astronomy by Naṣīr al-Dīn al-Ṭūsī (d. 1274). According to the original colophon copied at the end of the text, the commentary was completed on Tuesday, Dhū al-Ḥijjah 14, 811 [April 30, 1409] (see end of text, fol. 86a). The copy starts with the tenth quire (see inscription on the corner of fol. 5a). Before the beginning of the text, 4 leaves with inscriptions in Ottoman Turkish and Arabic, including verses of poetry attributed to Ibn Fāriḍ and Ibn Abī Ṭālib, and excerpted from al-Qaṣīdah al-Tāʼīyah al-Farīḍīyah fī al-tawḥīd wa-al-sulūk [by Ibn Fāriḍ].