Sahl ibn Bishr al-Israili
, often known as Zahel or Zael (c. 786-845 ?) was a Jewish astrologer
. He was the father of Ali ibn Sahl
the famous scientist and physician, who became a convert to Islam.
Sahl 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) (circa 1090- circa 1150). 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:
- Ahkam fi al-Nujum ("Laws of the Astrology")
- Kitab al-ikhtiyarat 'ala al-buyut al-ithnai 'ashar ("Book of elections according to the twelve houses").
- al-Masa'il al-Nujumiyah ("The astrological problems")