Today is Harvest Festival in here. According to wikipedia,Harvest is from an Anglo-Saxon word "haerfest" which meant 'Autumn.' It then came to refer to the season for reaping and gathering grain and other grown products. The full moon nearest the autumnal equinox is called the Harvest Moon. So in ancient traditions Harvest Festivals were traditionally held on or near the Sunday of the Harvest Moon. This moon is the full moon which falls in the month of September.