पृष्ठम्:चन्द्रछायागणितम्.djvu/१७

±viil CANDRACCHAYAGAISllrAM treatise on astronomy. As a work belonging to the Tantra class, it takes the commencement of the Yuga as the starting point for calculations. In the several chapters, it deals with : I. Astronomical constants and general principles and conceptions. II. Geocentric positions of the planets. III. The Sun's shadow. IV. Eclipses of the Moon and the Sun. V. Specialities in the Sun's eclipse. VI. Vyatipata. VII. The Phases of the Moon, etc. VIII. Srhgonnati of the Moon. 6. AryabhatTya-Bhasya, 1 an elaborate commentary on the cryptic and sutraAike text of Aryabha^a which comprehends in 121 aryas the fields of Mathematics and Astronomy. A perusal of the commentary will amply prove that it is no false claim that Nilakantha make* when he designates his wo,k as a 'mahabhasya' and explains the method of exposition adopted by him: ^m^fTO^TrgrTfeT?fT-5iire!Ti% Mvti ^^rs-qmsfasft^sm^m ww?m (TSS 101, p. 180). In another context, recalling how he came to write the commentary, Nilakantha remarks : surtmr mm g^cft: srferarefai (TSS 101, p. 156). The lucid manner in which the difficult conceptions about the celestial globe and astronomical calculations are made clear, the wealth of quotations, and the results of personal investigations and comparative studies presented herein amply justify the appellation 'Mahabhasya' which Nilakantha has given to his work. Nllakaatha has commented only on the Ganita, Kalakriya and Gala padas of the Aryabhatiya, leaving out the GitikSpada, which he says is covered by the commentary on the other three sections; cf. ?Nr TOTfcri (TSS 101, p. 1). 7. Siddhantadarpana-vyakhyZ, a commentary on his own Siddhantadarpana, of which an incomplete Ms. is available in the Palace Library Collection, Trivandrum, No. 975. The commentary is elaborate 1. Ed. in TSS 101, 110, 185 (1930, 1931, 1957).