Kaumudi Puja, or Koumudi Utsav, is observed during the full moon day in Ashwin month (September – October) in western and eastern parts of
. Kaumudi Puja 2015 date is October 26. The ritual is popularly known as Kojagari Lakshmi Puja and Kojagari Poornima. Koumudi means moon light and the festival and puja is held during the night of Ashwin Purnima. India
Goddess Lakshmi is worshipped during the night on the day.
There is a popular belief that the moon, or Chandra, is closest to earth during the Ashwin Purnima period. The rays of the moon are believed to have curative properties and it is believed that spending time in the moonlit night on the day will help in curing several diseases.
The day is observed as Sharad Purnima in many regions.