ABSTRACT
Nasir al-Din Tusi was a philosopher, astronomer, and mathematician. He worked as astronomer for the Mongol Khans and proposed a model of the study of planetary motion now known as the ‘Nasir al-Din couple’. He was the author of many works on theosophical and theological topics, including the Tajrid al-I’tiqadat (Definition of the Articles of Faith) and al-Akhlaq an-Nasiriyyah (The Nasirean Ethics). He is credited with having rescued, consolidated and systematised the best and most enduring aspects of Shi’a scholastic learning
