Islamic mathematician-astronomer
 (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-rūmī" "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 1° to an accuracy of 10−12.
Together with Ulugh Beg, al-Kāshī and a few other astronomers, Qāḍī Zāda 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.
Further reading.
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