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. He was born in Khujand (now part of Tajikistan) and lived in the late 10th century. He helped build an observatory, near the city of Ray (near today's Tehran), in Iran.
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