Abū Jaʿfar Khāzin, Muḥammad b. al-Ḥusayn al-Ṣāghānī al-Khurāsānī (ca. 290–360/930–971), was one of the most prominent mathematicians and astronomers of the 4th/10th century. Although he is frequently mentioned by other writers and numerous works have been attributed to him, there is little accurate information about his life or character. He was probably born in Ṣāghān, a village on the outskirts of Marw (al-Samʿānī, 8/252), and mostly went by his kunya (al-Qifṭī, 396). According to some sources (Pingree, 326; Dold-Samplonius, 334)…