Dragon Boat Festival, Mid-Autumn Festival and Double Ninth Festival are all lunar holidays. Why is Qingming a solar term?

Dragon Boat Festival, Mid-Autumn Festival and Double Ninth Festival are all traditional festivals of the lunar calendar. Qingming is also the lunar calendar, the fifth solar term in spring, beginning of spring, rain, fright, vernal equinox, Qingming and Grain Rain. Generally speaking, April 5 in the first half of the month is a solar term, and the second half is around 20, with a difference of two or three days at most. Tomb-Sweeping Day is an angry day for Tomb-Sweeping Day. There is a solar term in Song Like that goes like this:

The spring rain shakes the spring and the valley days, and the summer is full of mountains and summers.

Autumn dew, autumn frost, little snow in winter and cold in winter.

The first half of the year is June 2 1 day, and the second half is August 23.

The dates of the two festivals each month are fixed, with a difference of two or three days at most.