Is Tomb-Sweeping Day a lunar calendar or a solar calendar?

These special festivals in China are set according to ancient Chinese legislation!

The name "Tomb-Sweeping Day" also comes from the Tomb-Sweeping Day atmosphere in the twenty-four solar terms of the China lunar calendar. 108 The day after beginning of winter is Qi's 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 revolution of the earth is 360 degrees of the yellow meridian, and when the earth reaches zero degrees of the yellow meridian, it is designated as the vernal equinox, and then there is a solar term every time it runs 15 degrees, and there are 24 solar terms in * * *. Therefore, the dates of solar terms in the solar calendar are fixed, and there will be two-day differences in leap years.