According to the Chinese calendar, August 15 by the lunar calendar is the Mid-Autumn Festival. This name is due to the fact that the moon is fullest and most beautiful on this day.
農曆八月十五為中秋節，這天的月亮是一年中最圓最美的，中國傳統要吃圓餅慶賀，也就是「月餅」。