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This book presents an English-language translation of Risālā-yi Muʿīnīya, or the Muʿīnīya Epistle. Risālā-yi Muʿīnīya is one of the earliest known works of Naṣīr al-Dīn Ṭūsī (1201–1274), an intellectual luminary of the 13th century CE. The work is notable for the choice of Ṭūsī’s native Persian as the language of the text. In addition, Ṭūsī organized his volume into a four-part structure, which went on to become a popular template for the Islamic astronomers who succeeded him.  

This book helped ensure the patronage of...

As a leading scientist of the 13th century C. E. Qu b al-D n Sh r z wrote three substantial works on "hay'a "(or the configuration of the celestial orbs): " ""Nih yat al-idr k f dir yat al-afl k" ("The Limits of Attainment in the Understanding of the Heavens"), "al-Tu fa al-sh h ya f 'ilm al-hay'a" ("The Royal Offering Regarding the Knowledge of the Configuration of the Heavens"), and "Ikht y r t-i Mu affar " ("The Mu affar Elections"). Completed in less than four years and written in two of the classical languages of the Islamic world, Arabic and Persian, these works provide a fascinating...