The "Vakya" are considered Mantras . Using them to calculate your chart is believed to invoke the energy of the Rishis (sages) who first spoke them, offering a deeper spiritual connection than mathematical software.
In a , the Moon's position can vary by 30 to 45 minutes (arc) compared to the Drik system. This changes the Nakshatra (Birth star) and Thidi significantly. If you were born on a "cusp day" (border of two stars), your Vakya horoscope might show a different ruling deity than a Drik horoscope. vakya panchangam based horoscope