Both the Gregorian and Vedic calendars comprise twelve months. But whereas the number of days in each month varies in the Gregorian calendar, the Vedic months are all of the same duration: about fourteen days from the new moon to the full moon and from the full moon to the new. The day of the new moon is known as amavasya, and the full-moon day is known as purnima. And just as the Gregorian calendar is periodically adjusted during years known as “leap” years, the Vedic calendar is also adjusted,
