2. Tomb-Sweeping Day is actually Qingming among the 24 solar terms. According to the angle between the sun and the equator. So it has no fixed date on the lunar calendar. In the solar calendar, it is a day between April 4th and 6th. Specifically, it should be calculated according to the solar terms of one year.

3. Tomb-Sweeping Day, also known as outing festival, outing festival, March festival and ancestor worship festival, is celebrated at the turn of mid-spring and late spring. Tomb-Sweeping Day originated from the ancestral belief and the custom of worshipping spring in ancient times, which has both natural and humanistic connotations. It is both a natural solar term and a traditional festival. Grave-sweeping and outing are the two major themes of Tomb-Sweeping Day etiquette and customs, and these two traditional themes have been passed down from ancient times to the present in China.