How to treat the significance of modern Tomb-Sweeping Day?

Tomb-Sweeping Day gas point: Dou refers to B; The solar calendar is15; Gregorian calendar April 4-6. The "Twenty-four solar terms" were originally determined by the direction of the top of the bucket handle of the Big Dipper. The bucket handle starts from the "female" position and then rotates clockwise. When bucket handle points to the "second position", it is the spirit of Qingming. From the Han Dynasty to the early Qing Dynasty, the solar terms were divided by the "average time method", and the period from winter solstice to winter solstice of the following year was divided into 24 segments (each segment was 15 days), with winter solstice as the starting point of the "24 solar terms"; Tomb-Sweeping Day Qi is counted from the winter, that is, the first 105 day after winter. The current "twenty-four solar terms" come from the "fixed air method" concluded more than 300 years ago (used since 1645), which is determined according to the position of the sun on the ecliptic. When the solar calendar reaches 15, it is the node of Tomb-Sweeping Day.

"Huainanzi Astronomical Training": "On the fifteenth day after the vernal equinox, the bucket refers to B, then the Qingming wind will arrive"; The "Qingming wind" in the article is a refreshing and clear wind. At the age of 100, I asked, "When everything grows, it is pure and bright, so it is called 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."

Qingming is a solar term that reflects the phenological changes in nature. At this time, the sun is shining, plants are sprouting, the air is fresh, everything is alive, and nature presents a vibrant scene. By Qingming, the climate in the south is fresh and warm, and the earth presents a quiet image of spring; It began to snow in the north and gradually entered the sunny spring.