The sidereal coordinate procedure requires into account the ayanamsa, ayan that means "transit' or 'motion', and amsa that means 'small portion', i.e. motion of equinoxes in compact elements. It is unclear when Indians grew to become mindful of the precession in the equinoxes, but Bhāskara II's 12th-century treatise Siddhanta Shiromani https://knoxjvisc.activablog.com/20226266/the-smart-trick-of-astrology-that-nobody-is-discussing