Astronomical Calculations (Drik Siddhanta vs. Surya Siddhanta)

This digital calendar uses highly precise Drik Siddhanta (modern astronomical calculations) for generating Panchanga timings. Traditional printed Mutt calendars might use Surya Siddhanta (ancient models). Because of this mathematical difference, you may occasionally notice a 1-day offset in Tithis, Shraddhas, or Aradhanas between this calendar and printed versions, particularly when a Tithi ends near sunrise.