Written for advanced level students in the field of astronomy, based upon his notes from Qāḍīzāde's lectures and Shirwānī's  own experiences. The Sharḥ contains information on discussions with Qāḍīzāde, Ulugh Beg, and other students in the Samarqand madrasa. Information includes: about the Turkish calendar and other calendar systems; discussions on Euclid’s Elements; a registered copy of his license to teach (ijāza) from Qāḍīzāde; a lengthy discussion on optics (`ilm al-manāẓir) at the end of Book I of about 28 folios. [Fazlioglu and Ragep]