Grahanamukura - A Sexteenth Century Indian Manual for the Calculation of Eclipses

This is a study of a rare seventeenth century palm-leaf manuscript named the Grahaṇamukura, which has been carefully preserved in a private collection for more than 400 years. This manuscript was used to calculate eclipses, and has bilingual text, with verses in Sanskrit and a commentary in Kannaḍa, a southern Indian language. It is a handy manual for the prediction of eclipses following the methods prescribed in treatises. In the absence of the name of the author anywhere in the text, we conjecture that it was written by the father–son duo, Demaṇa Joyisaru and Śaṅkaranārāyaṇa Joyisaru of Sringeri. In this paper the contents of the text are summarized.