When people used the lunar calendar, the night of the full moon fell on the fifteenth night of each month. The full moon nights were called jugo-ya, and the full moon seen on the fifteenth night of the eighth month was thought to be the most beautiful full moon of the year. The full moon at this time of year looks especially beautiful in the clear autumn night sky. This moon is specially called chushu-no-meigetsu, which literally means the mid-autumn full moon. People traditionally viewed and admired the moon on the fifteenth night of the eighth month in olden times. Even now, many people view and admire the full moon and make offerings to it every year on the night of the full moon in September. This custom is called tsukimi in Japanese.