Bharatiya Jyotihshastra (History of Indian Astronomy), translated by R. V. Vaidya v1.c5.91

v1.c5.91

“The wise people describe the *Gaṇita Skandha* (i.e. the branch of mathematical astronomy) as that work, which gives in detail all the units of time from *Truṭi* (moment) to *Pralaya* (Universal deluge) and deals with the motions of planets, and which treats of mathematics in the form of questions and answers. It is mainly divided into two parts. It also describes the position of the earth, the stars, the planets and also the instruments for observation.”—*Siddhānta Śiromaṇi, Madhyamādhikāra*.