Muḥammad al-Qunawī, astronomer and muwaqqit (timekeeper), lived in Istanbul and pioneered the Turcification movement of the Greco-Hellenic and classical Islamic astronomical literature. After completing his education, Qunawī worked for some time  as the official muwaqqit or timekeeper in several religious institutions including the New (Yeni) Mosque in Edirne. He was in the service of various Sultans and dedicated: his Hadiyyat al-mulūk to Sultan Bāyazīd II, his Faḍl al-dā’ir to Sultan Selīm I, and his Mīzān al-Kawākib to Sultan Süleymān I (the Magnificient). Wrote 11 books on astronomy (7 in Arabic, 4 in Turkish); [Fazlioglu]