Poya

Poya or Poya Day is the name given to a Buddhist public holiday in Sri Lanka which occurs every full moon day. The Full moon is important to Buddhists all around the world, who have adopted the Lunar Calendar for their religious observances. Owing to the moon's fullness of size as well as its effulgence, the full moon day is treated as the most auspicious of the four lunar phases occurring once every lunar month (29.5 days) and thus marked by a holiday.