How big is Leng Yue?

The moon is basically round in the cold dew solar terms, because this year's cold dew is on the thirteenth day of the ninth lunar month. The shape of the moon has nothing to do with solar terms, but with the date of the lunar calendar. There is a jingle that says very well, about the moon phase, you can't see it on the second day of the first grade, and there is a line on the fourth day of the third grade, which is about half of the seventh and eighth grades. 15 is not round, and 16 round. On the 21st lunar month, the second moon becomes a semicircle again. The new moon faces west and the waning moon faces east.