Qāḍī Zāda al-Rūmī

Qāḍī Zāda al-Rūmī (1364 in Bursa, Ottoman Empire – 1436 in Samarqand, Timurid Empire), whose actual name was Salah al-Din Musa Pasha (qāḍī zāda 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)

Further reading

External links

• Ragep, F. Jamil (2007). "Qāḍīzāde al‐Rūmī: Ṣalāḥ al‐Dīn Mūsā ibn Muḥammad ibn Maḥmūd al‐Rūmī". In Thomas Hockey; et al. The Biographical Encyclopedia of Astronomers. New York: Springer. p. 942. ISBN 978-0-387-31022-0.  (PDF version)