What is the origin of Tomb-Sweeping Day and Cold Food Festival?

Tomb-Sweeping Day, also known as outing festival, outing festival, March festival, ancestor worship festival, etc. There are solar terms at the turn of mid-spring and late spring. It is not only one of the "24 solar terms", but also a traditional festival to worship ancestors. It is related to the time of the main branch and gossip, and has a long history, that is, the solar calendar reaches 15, which is Tomb-Sweeping Day Qi, and the node time is around April 5 of Gregorian calendar. At this time, the vitality is booming, the yin is declining, everything is "going to the old and welcoming the new", and the earth presents a scene full of spring, which is a good time to go for a walk in the spring and sweep the graves.

In the historical development, Tomb-Sweeping Day has merged into the custom of forbidding fire and cold food in the popular cold food festival in the northern region.

The Cold Food Festival is from summer to the future 105, one or two days before Tomb-Sweeping Day. Relevant historical records: During the Spring and Autumn Period, Zhong Er, the son of the State of Jin, went into exile in other countries to avoid disasters 19 years, and the minister Jiezitui always followed around and never left; Even "cutting stocks." Zhong Er tried to become a famous gentleman "Jin Wengong". But meson tui didn't want to make a fortune, so he lived in seclusion with his mother in Mianshan. Jin Wengong ordered the release of Yamakaji to force him out of the mountain, but meson was determined not to go out of the mountain and eventually died in a fire. Remembering his loyalty, Jin Wengong buried him in Mianshan, built a temple, and ordered that no fire and cold food be allowed on the day of Jiexiu's death to express his grief. Cold Food Festival, also known as "No Smoking Festival", "Cold Food Festival" and "Hundred Five Days Festival", follows the ancient habit of changing fire. In early spring every year, the climate is dry, not only the kindling preserved by people is easy to cause fire, but also the occurrence of spring thunder is easy to cause mountain fires.