(1364 in Bursa, Ottoman Empire – 1436 in Samarqand, Timurid Empire), whose actual name was Salah al-Din Musa Pasha (' means "son of the judge", al-rà «më "the Roman" indicating he came from Asia Minor, which was once Roman), was a Turkish astronomer and mathematician who worked at the observatory in Samarkand. He computed sin 1ð to an accuracy of 10<sup>âÂÂ12</sup>.
Together with Ulugh Beg, al-KÃÂshë and a few other astronomers, QÃÂá¸Âë ZÃÂda produced the Zij-i-Sultani, the first comprehensive stellar catalogue since the Maragheh observatory's Zij-i Ilkhani two centuries earlier. The Zij-i Sultani contained the positions of 992 stars.