Raghunatha Iyer Vakya Panchangam |top| -

: Derived from the sum of the Sun's and Moon's longitudes.

: Most scholars recommend Vakya for rituals and temple festivals but suggest Drik (Thiruganita) for casting accurate birth horoscopes due to its use of modern planetary positions. Raghunatha Iyer Vakya Panchangam

So, who was Raghunatha Iyer?