Grahaganita

Likewise,nothing happens to the number infinity when any(other)number enters (i.e., is added to) or leaves (i.e., is subtracted from) the infinity.It remains unchanged.

The third book or the Grahaganita deals with mathematical astronomy.The concepts are derived from the earlier works Aryabhata. Bhaskara describes the heliocentric view of the solar systemand the elliptical orbits of planets,based on Brahmagupta’s law of gravity.

Throughout the 12 chapters,Bhaskara discusses topics related to mean and true longitudes and latitudes of the planets,as well as the nature of lunar and solar eclipses.