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Qāḍī Zāda al-Rūmī
(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.
== His works ==
* Sharh al-Mulakhkhas (Commentary on Jaghmini's compendium on the science of Astronomy
* Sharh Ashkal al-Ta'sis (Commentary on Samarkandi's Arithmetics)
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