MAMS 2, pp. 96- 98 [no. 256]; GAS V.321-5, VI.222-4; Born: born in Būzjān (Būzhgān) in the region of Nīshāpūr, Iran; At the age of 20 he moved to Baghdad where he died. Leading astronomer and mathematician at the Buyid court, conducting observations and research in the Bāb al-Tibn observatory. Būzjānī 's principal astronomical work, and his sole extant writing on the subject, is Kitāb al-Majisṭī (Almagest). [B. Hashemipour]