What are the historical allusions about Tomb-Sweeping Day?

It is said that the origin of Tomb-Sweeping Day began with the "grave-sweeping" ceremony of ancient emperors and generals. Later, people followed suit, and it became a fixed custom of the Chinese nation to worship ancestors and sweep graves on this day. Originally, the Cold Food Festival and Tomb-Sweeping Day were two different festivals. In the Tang Dynasty, the day of sweeping graves was designated as the Cold Food Festival.

The name "Tomb-Sweeping Day" also comes from the Tomb-Sweeping Day atmosphere in the twenty-four solar terms of the China lunar calendar. 105 The first day after winter is Qi Tomb-Sweeping Day. Tomb-Sweeping Day gas * * * has 15 days. As it is Tomb-Sweeping Day, the time is after the vernal equinox. At this time, winter has gone, spring is full, the weather is sunny, the fields are bright and clean, and the vitality of nature is everywhere. It is an appropriate word to call this period "Qingming".

One hundred and five days after beginning of winter, the solstice was called cold food. In the past, fire was forbidden and cold food was eaten, so it was also called "Cold Food Festival" and "No Smoking Festival". According to folklore, cold food is to commemorate the burning of mesons in Mianshan during the Spring and Autumn Period, and Jin Wengong ordered the fire to be banned. Jiezitui is from Shanxi, so the custom of cold food is first popular in Shanxi. In the old days, cold food cut off fire, and the next day there was a ceremony to drill wood for fire in the palace, and the people also begged each other for fire with wicker.