Qadi Zada

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Salah ad-Din Musa Pasha , known as Ṣalāḥ ad-Dīn Mūsā ibn Maḥmūd ibn Muḥammad al-maʿrūf bi-Qāḍī Zāda ar-Rūmī , (* 1364 in Bursa , Ottoman Empire ; † 1436 in Samarkand ) was a Turkish mathematician and astronomer the madrasah and the observatory of Uluġ Beg in Samarkand.

biography

As his nickname shows, he is the son of a judge ( Qāḍī ) from the former Eastern Roman Empire (ar-Rūmī). His hometown Bursa was the capital of the Ottoman Empire until 1368. His father, Maḥmūd Effendi, was entrusted in addition to the judicial office of the management of the madrasah of Kapıcılar in Bursa, where Qāḍī Zāda received his first basic training.

Then he continued his training with the scholar al-Farnī (1350-1431) in Basra , in what is now Iraq . He made a name for himself through the Risālatun fī-l-ḥisāb , a treatise on arithmetic and algebra, which he wrote in Basra in 1383. In al-Farnīs advice, he continued his studies after 1407 in the city of Herat in the province of Khorasan , then later in Bukhara and Samarkand , continued. In 1410 he met the Timurid prince Uluġ Beg in Samarkand , who made him his teacher. During this time he wrote a number of commentaries on mathematics and astronomy, which were originally intended for the training of Uluġ Beg. Below is a commentary on the only 20-page treatise by Shams ad-Dīn Muḥammad ibn al-Asraf al-Ḥusainī al-Samarqandī on 35 theses of Euclid .

In 1420 Ulug Beg appointed him as one of the 70 scholars to the newly founded madrasah in Samarkand. Together with the astronomer al-Kāšī he constructed the observatory Gurchanī Zīǧ , of which he became director after the death of Al-Kāšīs. The work at the observatory was summarized in the star catalog Zīǧ-ī-Ṣulṭānī .

His most original mathematical work is the Risālatu-l-ǧaib (Treatise on the sine), in which he calculated the sine from 1 ° to 16 decimal places. At the same time, Uluġ Beg and / or Al-Kāšī arrived at the same result in a different way (see Uluġ-Beg medrese ).

There is still an incomplete commentary on the astronomical works of at-Ṭūsī and a treatise on mathematical methods for determining the Qibla , the direction of prayer to Mecca.

Web links

Individual evidence

  1. http://www-groups.dcs.st-and.ac.uk/~history/Biographies/Al-Samarqandi.html