Shams al-Dīn al-Samarqandī

Shams al-Dīn Muḥammad ibn Ashraf al-Ḥusaynī al-Samarqandī (Persian: شمس الدین سمرقندی; ) was a 13th century Islamic theologian, astronomer and mathematician from Samarkand, now in Uzbekistan.

Life Little is known of al-Samarqandi's life, who composed his most important works during the 13th and 14th centuries. He wrote works on theology, logic, philosophy, mathematics and astronomy which are important in their own right, but also provide information about the works of other astronomers. His treatise, , is a discussion of dialectic reasoning as used by the ancient Greeks. He wrote Synopsis of Astronomy, and produced a star catalogue for the year 1276–1277.

Al-Samarqandi wrote a 20-page work which discussed 35 of Euclid's propositions. In his preparation of the work, al-Samarqandi consulted the works of other Muslim mathematicians such as Ibn al-Haytham, Omar Khayyam, Al-Abbās ibn Said al-Jawharī, Nasir al-Din al-Tusi, and Athīr al-Dīn al-Abharī.