Nasir al-Din al-Tusi (1201–1274 CE) was a Persian polymath born in Tus, Iran. He made significant contributions to various fields including astronomy, mathematics, philosophy, and theology. Al-Tusi's most notable work was his astronomical observations and writings, which included the development of innovative mathematical models and instruments. He played a crucial role in the Maragheh Observatory, where he worked on refining Ptolemaic astronomical theories and proposed new models of planetary motion. Al-Tusi's influence extended beyond astronomy; he also made important contributions to mathematics, particularly in trigonometry and algebra. His legacy continues to be recognized in the Islamic world and beyond, with his works remaining influential in the fields of science, mathematics, and philosophy.