Yaʿqūb ibn Ṭāriq was an 8th century Persian1astronomer and mathematician. Yaʿqūb lived in Baghdad, and is considered to be one of the greatest astronomers of his time. In 767AD, at the court of al-Mansur, he probably met the Hindu Kankah (or Mankah?), who had brought there the Siddhanta. He wrote memoirs on the sphere (c. 777), on the division of the kardaja; and a zij, or collection of astronomical tables, derived from the Siddhanta, entitled Az-Zīj al-Mahlul min as-Sindhind li-Darajat Daraja.2 .
^ E. S. Kennedy, A Survey of Islamic Astronomical Tables, (Transactions of the American Philosophical Society, New Series, 46, 2), Philadelphia, 1956, p. 12 (zij no. 71).
