What is Tithi?

A Tithi is a lunar day, defined by the angular distance between the Moon and the Sun. Each tithi corresponds to a 12° gap, so there are 30 tithis in a lunar month.

Paksha

• Shukla Paksha — the waxing fortnight, from new moon to full moon.
• Krishna Paksha — the waning fortnight, from full moon to new moon.
• Purnima (full moon) and Amavasya (new moon) mark the boundaries.