Muhammad al-Qunawi

Muhammad al-Qunawi al-Muwaqqit
Muhammad al-Qunawi edition of al-Khalili's universal table
Born	15th century
Died	c. 1524 Istanbul, Ottoman Empire
Other names	Muhammad ibn al-Katib Sinan
Scientific career
Fields	Astronomy Timekeeping
Institutions	New Mosque of Edirne Sublime Porte

Muhammad ibn al-Katib Sinan al-Qunawi (died c. 1524), also known as Muhammad ibn Yusuf, was an Ottoman astronomer and muwaqqit (timekeeper) in the late fifteenth and early sixteenth century. A pioneer of Ottoman astronomy, especially in the field of astronomical instruments and timekeeping, he served as muwaqqit at various mosques, and eventually at the Sublime Porte under Suleiman the Magnificent (r. 1520–1566). He was influenced by earlier Mamluk astronomers, especially Shams al-Din al-Khalili (1320–1380) and Ibn al-Shatir (c. 1304—1375), as well as by the Central Asian Ali al-Qushji and Al-Biruni.

He wrote two treatises on the construction of the astrolabe quadrant (al-rub' al-muqantarat), including Hadiyat al-Muluk ("A Present for Kings") dedicated to Bayezid II (r. 1481–1512). He published a Turkish edition of Al-Khalili's universal tables, and compiled Mizan al-Kawakib ("Balance of the Stars"), containing tables that allow reading the time at night by observing the stars—"the most original Ottoman contribution to astronomical timekeeping by tables" according to historian of astronomy David A. King. In addition to the then commonly used Arabic, he also wrote in Turkish, in order to make his field more accessible throughout the empire. This tradition would be continued by astronomers such as Mustafa ibn Ali al-Muwaqqit. Taha Yasin Arslan writes that al-Qunawi "single-handedly pioneered" the science of timekeeping in the Ottoman Empire.