The Astronomical Observatories of Jai Singh c15.s1.t2.5

c15.s1.t2.5

(b) The Sūryaprajñapti is a Jain treatise on astronomy, that is similar in many respects to the Vedāṅga. The Jainas held the old Indian idea of the heavenly bodies revolving round Meru, and, as a corollary to this, they conceived two suns, two moons and two sets of constellations. The five-year cycle began with the summer solstice, with the sun in Pushya, and Thibaut thought³ this was a correction, from actual observation, of the older Vedāṅga.