Sahl ibn Bishr al-Israili (c. 786–c. 845), also known as Rabban al-Tabari and Haya al-Yahudi ("the Jew"), was a Jewish or Syriac Christian astrologer, astronomer and mathematician from Tabaristan. He was the father of Ali ibn Sahl the scientist and physician, who became a convert to Islam. He served as astrologer to the governor of Khuristan and then to the vizier of Baghdad. He wrote books on astronomy, astrology, and arithmetic, all in Arabic.

His works

Sahl is believed to be the first who translated the Almagest of Ptolemy into Arabic. Sahl ibn Bishr wrote in the Greek astrological tradition. Sahl's first five books were preserved in the translation of John of Seville (Johannes Hispanus) (c. 1090 – c. 1150). See the English translation by Holden. The sixth book deals with three thematic topics regarding the influences on the world and its inhabitants was translated by Herman of Carinthia. The work contains divinations based on the movements of the planets and comets. There are some books by Sahl ibn Bishr in Arabic such as: