Ganita-yukti-bhasa (Rationales in Mathematical Astronomy) of Jyesthadeva (c.1530) is a seminal text of the Kerala school of astronomy. Here is a critical edition of the entire Malayalam text along with an English translation and detailed explanatory notes.

A long-awaited translation of one of the most important - and hitherto least accessible - works in Indian mathematics, supplemented by detailed explanatory notes and commentary

Inhalt
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.