INTRODUCTION iii Tf A stands for agrd or the “sine of the amplitude, P for the equinoctial shadow, B the radius, then Brahmagupta's dge = A 32 x 12 = fal of the S.S. P2 72 12 x A = A ४+=phala of the S.S. +72 Sin' of t]ke sun's auds 12AP x 12 41 9 +(, 12A P \2 P2 + 2 ४. 7:2 P2 + 72 = +nge + W (GP!/)' + dge. of Brahmagupta = + paal¢ • • /phol}^ + Halo! of the Surg Sidhanta. Here by this insertion of Brahmagupta's rule in the modern Sघrga Siddlt, the renowned astronomer and mathematician has been nos, unfaitly deprived of his due credit. We aball not any further st11dy the similarity between the Brahmasphuta Shinta and the modern Saarya Siddhanta ; as we believe that we have established our view as to the nature of the modern Spgat Sikk%lt, that its earliext date is 400 A.D., Varaha, was 3 most important innovator to t at the middle of \he sixth century ; that its last redation took place after the time of Brahmagupta, and that Bentley's finding of this dato, eiहै 100 A.D. is quite reasonable. Othe Baylot Stata8 tied Regolatio728. As the modern Saga Sidhafa is a , composite growth so must be the case with the modern So Sidhafe, and other Hindu astronomical treatises called revelations. These works are
