Full Moon day is called Pournami or Poornima in South India. A Full Moon occurs when the Sun and the Moon are 180 degrees away from each other. On a Full Moon day, the Moon casts its illuminating radiance on earth all throughout the day, 24 hours. Praying the whole day will help one dissolve the bad negative karma of past lives and help change one`s destiny. It is a time for strengthening one`s positive energies through spiritual observances of prayer, meditation, recitation and fasting.
One must not eat anything except for fruits and milk during the day.