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