Abū Naṣr Manṣūr ibn ʿAlī ibn ʿIrāq al-Jaʿdī (Persian:ابونصر منصور بن علی بن عراق جیلانی; c. 960 – 1036) was aPersian^[1]Muslim mathematician andastronomer. He is well known for his work with the sphericalsine law.^[2][3]

Abu Nasri Mansur was born inGilan,Persia, to the ruling family ofKhwarezm, theAfrighids.^[4] He was thus a prince within the political sphere. He was a student ofAbu'l-Wafa and a teacher of and also an important colleague of the mathematician,Al-Biruni. Together, they were responsible for great discoveries in mathematics and dedicated many works to one another.

Most of Abu Nasri's work focused on mathematics, but some of his writings wereon astronomy. In mathematics, he had many important writings ontrigonometry, which were developed from the writings ofPtolemy. He also preserved the writings ofMenelaus of Alexandria and reworked many of the Greeks theorems.

He died in theGhaznavid Empire (modern-dayAfghanistan) near the city ofGhazna.

• Berggren, J. Len (2007)."Ibn ʿIrāq: Abū Naṣr Manṣūr ibn ʿAlī ibn ʿIrāq". In Thomas Hockey; et al. (eds.).The Biographical Encyclopedia of Astronomers. New York: Springer. pp. 557–558.ISBN 978-0-387-31022-0. (PDF version)
• O'Connor, John J.;Robertson, Edmund F.,"Abu Nasr Mansur ibn Ali ibn Iraq",MacTutor History of Mathematics Archive,University of St Andrews
• SamsÓ, Julio (2008) [1970-80]."Manṣūr Ibn 'Alī Ibn 'Irāq, Abū Naṣr".Complete Dictionary of Scientific Biography.Encyclopedia.com.

• Digitized manuscript (Risālah fī ṣanʿat al-asṭurlāb bi-al-ṭarīq al-ṣināʿī) - Folios 8A-12A, Sprenger 1876 (Berlin State Library)

• 10th-century Iranian mathematicians
• 960s births
• 1036 deaths
• Scientists who worked on qibla determination
• 10th-century Iranian astronomers
• 11th-century Iranian astronomers
• Astronomers of the medieval Islamic world
• Scholars from the Ghaznavid Empire
• People from Gilan province

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• Articles containing Persian-language text