Jyotihshastra: Astral and Mathematical Literature c4.s6.14

c4.s6.14

A treatise describing a semicircular instrument also derived from the native Indian tradition is the Yantracintāmaṇi²⁸¹ composed by Cakradhara,²⁸² probably in the late fifteenth or early sixteenth century; Cakradhara himself wrote a commentary on this, as did also Rāma (Yantradīpikā) in 1625. In the same Indian tradition are the works on yantras composed in the sixteenth century by Gaṇeśa, the author of the GL, at Nandigrāma in Gujarāt; these are the Cābukayantra, of which no copy is available to me, and the Pratodayantra,²⁸³ which is a special form of Sun dial.