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# Qāḍī Zāda al-Rūmī

**Qāḍī Zāda al-Rūmī** (1364 in Bursa, Ottoman Empire – 1436 in Samarqand, Persia), 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

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" (in Russian). Questions on the history of mathematics and astronomy I. Trudy Samarkand. Gos. Univ. (N.S.) Vyp. 229: 124–127.

Dilgan, H. (1970–80). "Qāḍī Zāda al-Rūmī". Dictionary of Scientific Biography. New York: Charles Scribner's Sons. ISBN 0684101149.

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)" (in Russian). Questions on differential equations, number theory, algebra and geometry. Trudy Samarkand. Gos. Univ. (N.S.) Vyp. 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" (in Russian). Istor.-Mat. Issled. 13: 33–538.

Rozenfel'd, B. A.; A. P. Yushkevich (1960). "Notes on a treatise of Qadi Zada al-Rumi" (in Russian). Istor.-Mat. Issled. 13: 552–556.

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 9780387310220. (PDF version)

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