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The Grahaganit and Goladhyaya deal with the astronomy of heavenly bodies based on the Surya Siddhanta. In the third chapter, he describes the situation of the earth, unsupported in space, and how beings exist on the surface of this spherical earth. He deals also with the circumference, surface area, and volume of the earth, using pi as 3.1416. He calculates the length of the sidereal year, the time taken for the earth to revolve round the sun, as 365.2588 days. The modern value is 365.2563, with a difference of only 3.5 minutes! The fifth chapter looks at the mean motions of the sun, moon, and planets. The sixth and eighth chapters show how to calculate sunrise by calculating the lunar crescent, how to find out the relative lengths of days and nights in different seasons and latitudes. It also teaches how to find the latitude of a place. The next three chapters deal with eclipses and another chapter deals with astronomical instruments used for observing heavenly bodies. At the end he concludes that intelligence is a better tool than all instruments!