Not clear if this treatise is by or dedicated to Maḥmūd Shāh Khaljī. The introduction says that the treatise originally comprised an introduction (muqaddima), two chapters (bāb), and a conclusion or appendix (khātima).  The last chapter and appendix were already lost during the author’s lifetime.  The introduction has thirty-six sections (faṣl). The first of these sections is the best-known because it was published, with facing Latin translation, by John Greaves in his Astronomica quaedam (London, 1652).  This initial section contains basic geometrical definitions, an elementary introduction to Islamic hay’a (cosmography and cosmology), and some brief explications of concepts used in spherical astronomy.  Sections 2 – 24 deal with topics from arithmetic and calculations useful for spherical astronomy.  Sections 25 – 36 describe the astrolabe and its use.  The work is usually cataloged as a commentary on the Zīj-i Ilkhānī of Naṣīr al-Dīn al-Ṭūsī. 