Tithi
Pratipada Meaning
Pratipada is the first tithi after Amavasya or Purnima. In panchang, tithi is calculated from the angular distance between the Sun and Moon, so its start and end time can vary by location.
In Simple Terms
Pratipada is the first tithi after Amavasya or Purnima. Its exact use depends on the wider panchang context: tithi, nakshatra, yoga, karana, vaara, and local sunrise.