Flourished: Iran, 1092–1108; Ṭabari lived in Iran under the Saljūqs, probably in Āmul, and is the author of 2 independent treatises in Persian on the astrolabe (which are among the oldest extant Persian texts on the subject) as well as several other books, including 2 on arithmetic. He must have lived earlier than the 13th century, based upon manuscript sources and since he is mentioned by al-Bayhaqī in his Tatimmat ṣiwān al-ḥikma (1164). The first astrolabe treatise is known under the title Shish faṣl (Six chapters [on the knowledge of the astrolabe]), the oldest manuscript copy dating to 1176–1177. It was probably composed at the request of some students and is arranged in a question-answer (q/a) format. The second treatise is a shorter and simplified version of the “Six Chapters” and is arranged simply into 104 entries. Entitled `Amal wa-alqāb ([On the] functions and names [of the astrolabe]), the oldest extant manuscript copy is dated 1162. It was written for a certain nobleman of his time, who is named in two copies as Abū al-Fatḥ Dawlatshāh b. Sulaymān. [Ž. Vesel]