What time is it in Tomb-Sweeping Day?

Tomb-Sweeping Day is usually around April 5th, the first15th day after the vernal equinox.

Because the lunar calendar is a collection of solar calendar and lunar calendar with strict astronomical calendar nature, solar terms and lunar calendar are all part of it.

Solar terms are also the calendar days of the lunar calendar, and they are the scales of the sun's apparent position. They are only expressed in the form of nodes, not in the format of a certain month and day of the lunar calendar, because strictly speaking, there is no concept of "month" in the solar calendar in astronomy (the month of the solar calendar is borrowed from the lunar calendar, but only a simple fragment of the calendar year, which is "attached" to the calendar year and has no astronomical significance), and the month is a concept in the lunar calendar.

As soon as Qingming arrives, the temperature rises and the rainfall increases, which is a good time for spring ploughing and planting. Therefore, there is an agricultural proverb that "before and after Qingming, point melons and plant beans" and "planting trees is not as good as Qingming". It can be seen that this solar term is closely related to agricultural production.

However, Qingming, as a festival, is different from pure solar terms. Solar terms are symbols of phenological changes and seasonal order in China, while festivals contain certain customs and activities, which have certain commemorative significance.