therefore, been assigned to them wherever necessary. In their edition below, these tracts have been classified and arranged in such a manner as to give their presentation some sort of sequence. Thus, the recasts are placed first, and, then, in order, the tracts on the Revolutions, Mean Planets, Zero dates and corrections, and the Diagram of True Planets.
The last Appendix, viz., the Chayastakam of Acyuta, author of Sphutaniraaya, which gives directions for the computation of the gnomon's shadow due to the Moon, is again, the result of a discovery from among the miscellaneous matter in an astronomical codex.
Appendix I. Sphutanirņaya-sañigraha is a recast of the Sphuțaniraaya-tantra in simpler verses, the arrangement of the topics being sometimes different. The special characteristic of the Sangraha is that the astronomical constants and other numerical figures given in the original in the bhuta-sankhya notation have been depicted here in the more facile katapayādi notation. Besides this, the Sangraha gives also the results of certain computations, of which only the working procedures have been indicated in the original. For instance, it gives the computed results of the zero-corrections of the planets correct to one-sixtieth of the second and of the apses and nodes correct to one-three hundred and sixtieth of the second, while, in the Sphutanirnaya, only the method for such computation has been indicated. Unfortunately, the only manuscript of the Sangraha now available extends but through the first two chapters of the original.
The present edition of the Sangraha is based on Ms. Jy. 568 [P) of the Government Sanskrit College Library, Tripunithura (Cochin, Kerala). About fifty shorter works on jyotisa, hitherto unidentified and uncatalogued, are contained in this very readable plan-leaf codex in Malayalam script, numbered 568 and accessioned under the generalized title Ganitagrantha. The text of the Sangraha preserved herein is fairly pure. The codex carries different dates at different places, to wit: Kollam era 1000 (A.D. 1825) on fol. 43b, 1013 (A.D. 1838) on fol. 94 a, 1016 (A.D. 1841 ) on fol. 96 b, 1017 (A D. 1842) on fol. 94b etc. The uniformity and continuous nature of the writing in the present codex rules out the possibility of these being the dates on which the different sections of the codex were written. On the other hand, these dates appear to have been carried over from an earlier codex from which the present codex has been copied.
