1. The date of the Mid-Autumn Festival in 2021 in the lunar calendar: Tuesday, September 21, 2021, August 15th in the Year of the Ox (Year of the Ox).

2. The Mid-Autumn Festival originated from the worship of celestial phenomena and evolved from the worship of the moon on Autumn Eve in ancient times. In traditional culture, the moon is the same as the sun. These two alternating celestial bodies have become the objects of worship by the ancestors. The Mid-Autumn Festival originated from the ancient people's worship of the moon and is the remnant and derivative of the Chinese nation's custom of worshiping the moon. Sacrifice to the moon is a very ancient custom in our country. It is actually an activity of worshiping the "Moon God" by the ancients in some places in my country in ancient times. According to research, the "Moon Sacrifice Festival" was originally set on the "autumn equinox" day of the 24th solar term of the Ganzhi calendar. However, due to the later change of the calendar to use the lunar calendar (summer calendar), the "autumn equinox" day in August of the lunar calendar changes every year. There may not always be a full moon. Later, the "Moon Sacrifice Festival" was adjusted from the "autumn equinox" of the 24 solar terms in the Ganzhi calendar to the 15th day of August in the lunar calendar. In some places, the Mid-Autumn Festival is set on the 16th day of the eighth month in the lunar calendar. day. The Mid-Autumn Festival is a synthesis of autumn seasonal customs, and most of the festival elements contained in it have ancient origins. Since ancient times, the Mid-Autumn Festival has included worshiping the moon, appreciating the moon, eating moon cakes, playing with lanterns, appreciating osmanthus flowers, drinking osmanthus wine and other folk customs, which have been passed down to this day and lasted for a long time.