Purnima, or Poornima, is the full moon day in a traditional Hindu lunar calendar. Purnima December 2010 is December 21. It is the last day in a month in the calendar followed in
North India. The Purnima in December is the Margshirsh Poornima. The full moon day is known as Pournami in South India.
Fasting from sunrise to sunset is observed by some Hindus on the day.
It must be noted that in some calendars Margshirsh Purnima begins on the afternoon of December 20 and ends on December 21.