Birjandī's commentary is massive, over 250 folios. Sanskrit translation by Nayanasukha and his assistant Muḥammad Ābida of Bk II, Ch. 11 [Ragep, Tadhkira, p. 57] From the colophon we learn that Ābida (who had been at Jai Singh's court since 1725), dictated it (presumably in a vernacular language) to Nayanasukha. Birjandī cites the following authors and works: Ṭūsī’s Risālah-i mu`īniyya; Ptolemy’s Almagest; Ibn al-Haytham; Euclid’s Elements;  Quṭb al-Dīn al-Shīrāzī’s Tuḥfa and Nihāya; Theodosius’s Sphaerica; Menelaus; and, Autolycus. [BEA]