Tithi
Purnima Meaning
Purnima is the full moon tithi. 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
Purnima is the full moon tithi. Its exact use depends on the wider panchang context: tithi, nakshatra, yoga, karana, vaara, and local sunrise.