This book provides the first presentation of the bilingual textual material that illustrates the transmission of Islamic astronomy to scientists of the Indian Sanskritic tradition. It includes editions of the chapter of the Tadhkira in which the mid-thirteenth century Persian astronomer, Nasīr al-dīn al-ṭūsī discussed the new solutions that he devised to overcome certain technical problems in the lunar and planetary models of Ptolemaic astronomy and of the learned commentary composed by al-Birjandī in the early sixteenth century together with the Sanskrit...