Is Tomb-Sweeping Day one of the 24 solar terms?

Yes, Tomb-Sweeping Day is also one of the 24 solar terms in the lunar calendar, just after the vernal equinox and before Grain Rain. "Almanac": "On the fifteenth day after the vernal equinox, the bucket refers to the ding, which is used for Qingming. Everything is clean and bright, and it covers the time (the temperature rises, the fog in the south is less, the sand in the north disappears, and the air permeability is good), hence the name." Astronomical time: the sun is located at 15 degrees, and Tomb-Sweeping Day is from April 4th to April 6th in Gregorian calendar.