Bharatiya Jyotihshastra (History of Indian Astronomy), translated by R. V. Vaidya v1.c5.98

v1.c5.98

In the books on astronomy in this country, the chapter which generally deals with such problems as positions of the sun, the moon, the earth, etc. in the universe, the causes of their motions and the nature of such motion is known as *Bhuvana Saṃsthā*, *Jagat Saṃsthā*, *Bhuvana Kośa* or by some other equivalent names. These three subjects will be discussed in detail later on at the proper place; but to introduce the subject, the celestial sphere, the motions of planets, the movement of the solstitial points, and the *Yuga* system of measuring time are briefly described below.