Description
Ganita-yukti-bhasa (Rationales in Mathematical Astronomy) of Jyesthadeva (c.1530) is a seminal text of the Kerala school of astronomy. It is composed in the Malayalam language and presents detailed yuktis or explanations and demonstrations for the results and processes of mathematical astronomy. The text, comprising fifteen chapters, is naturally divided into two parts, mathematics and astronomy, and purports to give an exposition of the techniques and theories employed in the computation of planetary motions as set forth in the great treatise Tantrasangraha (c.1500) of Nilakantha Somayaji. Even though the importance of Ganita-yukti-bhasa was brought to the attention of modern scholarship by C.M Whish in the 1830s, a critical edition of the entire Malayalam text is published here for the first time along with an English translation and detailed explanatory notes. Volume I: The Eight Mathematical Operations; The Ten Questions and Answers; Arithmetics of Fractions; Rule of Three; Kuttakara; Circle and Circumference; Derivation of Sines. Volume II: Computation of True Planets; Earth and Celestial Spheres; The Fifteen Problems; Gnomonic Shadow; Eclipse; Vyatipata; Maudhya and Visibility Corrections of Planets.
