Flourished (Iran), 1092–1108
Ṭabari lived in Iran under the Saljūqs, probably in Āmul, and is the author of two independent treatises in Persian on the astrolabe as well as several other books, including two on arithmetic. Although several modern studies place him in the thirteenth century, he must have lived earlier 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:
- 1.
On the parts of the astrolabe and their names (60 q/a);
- 2.
On lines, figures, inscriptions, and circles on the astrolabe (77 q/a);
- 3.
On knowing the functioning of the back part of the astrolabe (49 q/a);
- 4.
On knowing the functioning of the face side of the astrolabe (136 q/a);
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Vesel, Ž. (2014). Ṭabarī: Abū Jaҁfar Muḥammad ibn Ayyūb al-Ḥāsib al-Ṭabarī. In: Hockey, T., et al. Biographical Encyclopedia of Astronomers. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-9917-7_1357
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