Why isn't Tomb-Sweeping Day Lunar New Year's Day and Lunar New Year?

1, Tomb-Sweeping Day is not only a festival, but also one of the 24 solar terms (namely, Tomb-Sweeping Day Qi), and its date itself is calculated according to the solar calendar. Tomb-Sweeping Day Qi is a moment in the astronomical calendar, and its time depends on the orbit of the sun. When the sun reaches 15, the time point is Qingming on April 5 or 6 of the solar calendar every year. Tomb-Sweeping Day Qi is a sign of phenological changes and seasonal order in China, which belongs to the solar calendar.

The twenty-four solar terms are divided according to the position of the sun on the ecliptic (that is, the orbit of the earth around the sun). Therefore, the dates of solar terms in the solar calendar are basically fixed. Every year in Tomb-Sweeping Day, it is around April 5, only a day or two away. However, the dates in the lunar calendar have changed a lot. If calculated according to the lunar calendar, the date of solar terms is not easy to determine, which will affect the overall calendar and people's production and life.