Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Abu Mahmood Khujandi was a Persian astronomer and mathematician who lived in the late 10th century and helped build an observatory near the city of Ray (near today's Tehran) in Iran. He was born in Khujand (now Tajikistan) in about 940, and died in 1000. A bronze bust of the astronomer is present in a park in modern-day Khujand. The few facts about Khujandi's life that are known come from both his surviving writings and comments made by Nassereddin Tusi. From Tusi's comments it is fairly certain that Khujandi was one of the rulers of the Mongol tribe in the Khudzhand region, and thus must have come from the nobility.
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