Abu-Mahmud Khujandi

Al-Khujandi
الخجندي
Al-Khujandi ; الخجندي
Born	940; Khujand, Samanid Empire (modern-day Tajikistan)
Died	1000 (aged 60); Ray, Buyid dynasty (modern-day Iran)
Academic work
Era	Islamic Golden Age ; (Samanid dynasty era)
Main interests	Astronomer, Mathematician
Notable works	Encyclopedia of Astronomy & Astrophysics
Notable ideas	Al-Khūjāndī’s discovery of spherical law of sines,; Constructed the first huge mural sextant in 994 CE;

Abu Mahmud Hamid ibn al-Khidr al-Khujandi (known as Abu Mahmood Khujandi, al-khujandi or Khujandi, Persian: ابومحمود خجندی, c. 940 – 1000) was a Transoxanian astronomer and mathematician born in Khujand (now part of Tajikistan) who lived in the late 10th century and helped build an observatory, near the city of Ray (near today's Tehran), in Iran.

Al-Khujandi الخجندي
Born	940 Khujand, Samanid Empire (modern-day Tajikistan)
Died	1000 (aged 60) Ray, Buyid dynasty (modern-day Iran)

Academic work
Era	Islamic Golden Age (Samanid dynasty era)
Main interests	Astronomer, Mathematician
Notable works	Encyclopedia of Astronomy & Astrophysics
Notable ideas	Al-Khūjāndī’s discovery of spherical law of sines, Constructed the first huge mural sextant in 994 CE