haraf al-Din al-Ṭūsī spent a major part of his early career as a teacher of the sciences, including astronomy and astrology, in Damascus and Aleppo; he also taught in Mosul. Among his students was Kamāl al-Dīn ibn Yūnus, who would eventually teach Sharaf’s namesake, the great Naṣīr al-Dīn al-Ṭūsī. [Van Brummelen]