From then on, sacrificing to the moon was very popular, and has become a custom ever since.
There is a legend that Emperor Xuanzong of the Tang Dynasty visited the Moon Palace in his dream and heard a wonderful song.
But the term only related to the time and season; the festival didn't exist at that point.
To the Chinese, a full moon is a symbol of prosperity, happiness, and family reunion.
Many poets liked to create poems related to the moon when appreciating it.