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Nasīr al-Dīn Tūsī
Nasir al-Din Tusi.jpg
Iranian stamp for the 700th anniversary of his death
Religion Islam
Born 18 February 1201
Tus, Khorasan
Died 26 June 1274(1274-06-26) (aged 73)
Al-Kadhimiya Mosque, Kadhimiya, Baghdad, Ilkhanate
Senior posting
Title Khawaja Nasir
Religious career
Students Shams ad-Din Al-Bukhari
Works Rawḍa-yi Taslīm, Tajrīd al-'Aqa'id,
Akhlaq-i-Nasri, Zij-i ilkhani,
al-Risalah al-Asturlabiyah,
Al-Tadhkirah fi'ilm al-hay'ah
Influenced Maitham Al Bahrani, ibn Khaldun, Qutb al-Din Shirazi, Ibn al-Shatir, Copernicus

Muhammad ibn Muhammad ibn al-Hasan al-Tūsī (Persian: محمد بن محمد بن حسن طوسی‎ 24 February 1201 – 26 June 1274), better known as Nasir al-Din Tusi (Persian: نصیر الدین طوسی; or simply Tusi in the West), was a Persian polymath, architect, philosopher, physician, scientist, and theologian. He established trigonometry as an independent branch of mathematics. He was a Twelver Shia Muslim. Ibn Khaldun (1332–1406) claimed Tusi was the greatest of the later Persian scholars.


A 60-km diameter lunar crater located on the southern hemisphere of the moon is named after him as "Nasireddin". A minor planet 10269 Tusi discovered by Soviet astronomer Nikolai Stepanovich Chernykh in 1979 is named after him. The K. N. Toosi University of Technology in Iran and Observatory of Shamakhy in the Republic of Azerbaijan are also named after him. In February 2013, Google celebrated his 812th birthday with a doodle, which was accessible in its websites with Arabic language calling him al-farsi (the Persian).

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