Sahl ibn Bishr

Sahl ibn Bishr (fl. 205 AH/AD 821–235 AH/AD 850) was an astrologer and mathematician at the service of the governor of the Khurāsān Ṭāhir ibn al-Ḥusayn al-Aʽwar (205/821–207/822) and who later served al-Ḥasan ibn Sahl (died 236/ 850–1) secretary and governor of caliph al-Ma’mūn (198/813–218/833). This implies that he was in Baghdad during the great programme of astronomical research patronised by al-Ma’mūn and when the interest in astrology, which had begun under al-Manṣūr (136/754–158/775), reached its apex.

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