Vedic astrology glossary
What is a Tithi?
Also known as: lunar day
A tithi is a lunar day — the time it takes the Moon to gain 12° over the Sun. There are 30 tithis in a lunar month, split across the waxing (Shukla) and waning (Krishna) fortnights.
Tithis govern many festivals and vratas and are one of the five limbs of the Panchang.