Appendix IX. Grahasphuta-parilekhah. This is a very interesting work, couched in resonant sragdhara metre, perhaps complete in eight verses, but, of which its lone manuscript preserves only six. The author of this anonymous work observes, at the outset, that in computing the True Position of a planet as seen by an observer stationed on the surface of the earth, due cognisance has to be taken for his position being different from the centre of the celestial sphere as Well as from the centre of the earth, and due corrections effected. Detailed directions are then given for constructing diagrams to chart the True Positions of the different planets at any moment.
The work was discovered from among the uncatalogued and unidentified matter towards the end of Ms. No. C. 809-C of the Kerala Univ. Or. Res. Inst. and Mss. Library, in close continuation of the Sphutanirnaya with commentary, (No. C. 809-C, being our Text Ms. C). The verses preserved are generally free from errors and the only regret is that the manuscript is slightly damaged and is incomplete.
Appendix X. Chayaganitam of Acyuta. The work instructs in detail the computation of the gnomon's shadow due to the Moon. The Ms. was found interspersed with certain other astronomical tracts in Ms. No. 4116 of the Maharaja's Palace Library, Trivandrum, This composite codex is catalogued under the general title Drigganitakramam in the Des. Cata. of the Mal. Mss. in H.H. The Maharaja's Palace Library, Trivandrum, vol. II, pp. 453-54 and as Jyā-vaidhrta-lāțaganaitam in the Revised Cata. of the Palace Granthappura, p. 205. It is a moderately old plam leaf manuscript, inscribed in readable Malayalam script. But the writing is far from perfect, there being scribal errors, omissions and repetitions.
Acknowledgements
The twenty-two manuscripts which have formed the basis of the critical editions included in this publication belong, primarily, to three public repositories of South Indian manuscripts, viz., the Kerala University Oriental Research Institute and Manuscripts Library, Trivandrum, the Govt. Oriental Manuscripts Library, Madras, and the Govt. Sanskrit College Library, Tripunithura (Cochin). I am greatly indebted to the authorities of all these institutions for the co-operation which they have extended to me in my editorial work. I have used also certain manuscripts belonging to the private collections of the
