# 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**(

*means "son of the judge",*

*qāḍī zāda**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[edit]

- 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[edit]

- Adivar, A. (1943).
*Osmanli Türklarinde Ilim*. Istambul. - Ataev, U. (1972). "The commentary of Kazi-zade ar-Rumi on the astronomical treatise of Nasir ad-Din at-Tusi".
*Questions on the history of mathematics and astronomy I. Trudy Samarkand. Gos. Univ. (N.S.) Vyp.*(in Russian).**229**: 124–127. - Dilgan, H. (1970–80). "Qāḍī Zāda al-Rūmī".
*Dictionary of Scientific Biography*. New York: Charles Scribner's Sons. ISBN 978-0-684-10114-9. - O'Connor, John J.; Robertson, Edmund F., "Qadi Zada al-Rumi",
*MacTutor History of Mathematics archive*, University of St Andrews. - Pasaev, Z. A. (1972). "The commentary of Kazi-zade ar-Rumi on the astronomical treatise of al-Djagmini (a brief survey)".
*Questions on differential equations, number theory, algebra and geometry. Trudy Samarkand. Gos. Univ. (N.S.) Vyp.*(in Russian).**202**: 202–204. - Rozenfel'd, B. A.; A. P. Yushkevich (1960). "The treatise of Qadi Zada al-Rumi on the determination of the sine of one degree".
*Istor.-Mat. Issled.*(in Russian).**13**: 33–538. - Rozenfel'd, B. A.; A. P. Yushkevich (1960). "Notes on a treatise of Qadi Zada al-Rumi".
*Istor.-Mat. Issled.*(in Russian).**13**: 552–556.

## External links[edit]

- 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)

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