The Vakya system is rooted in the computational methods found in Siddhānta texts like the . Unlike modern "Drik" (observation-based) systems, the Vakya system relies on:
The Raghunatha Iyer version specifically preserves the astrological heritage of the tradition, often serving as a primary reference for Hindu communities in Sri Lanka and the diaspora. Raghunatha Iyer Vakya Panchangam
: It primarily uses the text Vākyakaraṇa as its base for astronomical data. Key Components: The "Five Limbs" The Vakya system is rooted in the computational
: Derived from the sum of the Sun's and Moon's longitudes. Raghunatha Iyer Vakya Panchangam
: The stellar constellation the Moon is currently transiting.