Mathematics in Ancient and Medieval India c9.17

c9.17

Bhāskara’s concept about the motion of the planets will be clear from his own commentary³ on the verses to calculate the *tātkālikī* motion of a planet. He clearly distinguishes between *sthulagati* (velocity roughly measured) and *sukṣmagati* (velocity measured accurately with reference to indefinitely small quantities of space and time). Here Bhāskara II’s *tātkālikī-gati* may be defined as the ‘infinitesimal’ increment in the planet’s longitude due to ‘infinitesimal’ increment in time.