The new moon day is called Amavasya and is observed as a day of fasting in many Hindu households. Since the Hindu calendar is organized according to the lunar month, Amavasya is the beginning of the new lunar month which last 29 days. Many festivals, the most famous being Diwali (the festival of lights) are observed on this day. The importance of Amavasya is that it is a day of new beginnings. It is a time to discard the old (habits, thought processes, failures and negative influences) and embrace the promise of new ? light? that the new moon brings to us. The ?dark? side of the moon is revealed on this day as the moon completes its waning cycle of fourteen days ? the ancients considered this day with a lot of fear and trepidation because they thought that the moon had been swallowed by the sun. The first day of the waning cycle is actually the full moon day, also called purnima.