Why is Tomb-Sweeping Day called Tomb-Sweeping Day?

Tomb-Sweeping Day is named after Qingming, one of the 24 solar terms in the lunar calendar. It starts around April 5th (Gregorian calendar) when the sun reaches 15. Originally, Tomb-Sweeping Day was just a simple agricultural solar term. Later, due to the close dates of Tomb-Sweeping Day and the Cold Food Festival and Shangsi Festival, some customs of the Cold Food Festival and Shangsi Festival gradually moved to Tomb-Sweeping Day, making it an important festival.

For the name of Qingming, please refer to the following ancient books:

Twenty-four solar terms: Tomb-Sweeping Day and March Festival. According to "Mandarin", there are eight winds, and the calendar refers to the Qingming wind, that is, the March Festival. This wind is a mystery. Everything is in harmony, and everything is clear by this time. "

"When I Ask a Hundred Questions" says: "When everything grows, it is pure and bright, hence the name Qingming."

"Almanac": "On the fifteenth day after the vernal equinox, the bucket refers to Ding, which is used for Qingming, when everything is clean and bright, and when it is covered, everything is clean and bright, hence the name."