The Tantrasangraha is a major work of Nilakantha Somayaji (A.D. 1444-1545), one of the eminent Kerala astronomers of mediaeval times. It is a full-fledged text on Hindu astronomy which deals, in eight chapters, with the more important aspects of the discipline, including the Mean and True planets, Gnomonic and related computations, Lunar and Solar eclipses, the phenomenon of Vyatipata when the Sun plus Moon is equal to 180°, Reduction to observation of planetary positions (Drkkarma) and the Elongation of the Moon's horns (Candra-srngonnati). It incorporates also new methodologies and corrections introduced by the author towards accurate astronomical computation. The text of the Tantrasangraha is edited here critically, along with two commentaries, of which the first commentary called Yuktidipika gives an elaborate exposition of mathematical and astronomical concepts and computations, in simple verses. Since, however, this commentary extends only through chapters I-IV, a second commentary called Laghuvivrti has been added for the rest of the work. This latter commentary, which is concise and matter of fact, has already been issued through the Trivandrum Sanskrit Series, No. 188, (Trivandrum, 1958), but in the present publication, its edition has been made more reliable and critical by the employment of two highly accurate manuscripts.
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