Bharatiya Jyotihshastra (History of Indian Astronomy), translated by R. V. Vaidya v1.c5.93

v1.c5.93

In the *Siddhānta* work the beginning of the *Kalpa* is taken to be the epoch ; in the *Tantra* the epoch is the beginning of a *Mahāyuga*, and in the *Karaṇa* any *Śaka* year can be the epoch, and the calculations of planets’ places are made on the basis of the respective epochs. As a matter of fact there is no difference between them in regard to the computation of planetary positions excepting that each adopts a different epoch. The part of the work devoted to planetary calculations in all the three varieties contains a number of chapters called *Adhyāya* or *Adhikāra*. In general, the chapters are as follows :—