 Alias title:  شرح التذكرة 
The Tawḍīḥ al-Tadhkira is a commentary on Ṭūsī’s al-Tadhkira fī ˁilm al-hay’a; it was Nīsābūrī’s third and final text on astronomy, but he began composing it before finishing his Sharḥ al-Taḥrīr al-Majisṭī ( a commentary on Ṭūsī’s Recension of Ptolemy’s Almagest).  The Tawḍīḥ was written for the non-expert astronomers and Nīsābūrī investigates theoretical topics, such as non-Ptolemaic models for planetary motions, and topics that combined theory and observations, such as physical hypotheses that accounted for the observed variations in the obliquity of the ecliptic. Nīsābūrī dedicated the Tawḍīḥ to a certain `Ali ibn Maḥmūd al-Yazdī. Ownership statements from manuscripts indicate the Tawḍīḥ was an important text at Ulugh Beg’s (d. 1449)  Samarqand madrasa for the study of the Tadhkira. [R. Morrison, BEA]