Research Article

Ulugh Beg’s Treatise on the Altitude Circle

Abstract

Ulugh Beg was an influential figure in the history of astronomy and a key patron of the vibrant scholarly environment that flourished in ninth/fifteenth-century Samarkand. The intellectual milieu that emerged as a result of his patronage fostered dynamic exchanges between scholars and students across various scientific disciplines, leaving a lasting impact. Among his lesser-known works is a brief treatise on a problem in spherical astronomy. This treatise investigates the position of the altitude circle in various situations across different localities. Despite the simplicity of its subject matter, this text offers valuable insight into the nature of scholarly engagement under Ulugh Beg’s rule. This paper presents a critical edition, English translation, and analytical study of the treatise, situating it within the broader intellectual context of Timurid Samarkand.

Keywords

Ulugh Beg Samarkand Qāḍīzāda Shirwānī Jaghmīnī Jurjānī spherical astronomy altitude circle