Abū Yaḥyā al-Biṭrīq (d. ca. 184/800) was a translator of Greek works into Arabic, and a contemporary of al-Manṣūr, the ʿAbbāsid caliph, and his successors. He was familiar with astronomy, astrology, mathematics and medicine (Leclerc, 1/178; Suter, 4). There is no information available about the time and place of his birth; the year of his death has been mentioned as being between 180–190/796–806 (Sarton, 1/537). At the time of al-Manṣūr, problems and issues in the field of astronomy received much …