What was the solar term before Tomb-Sweeping Day?

The solar term before the vernal equinox in Tomb-Sweeping Day is one of the vernal equinox, vernal equinox and twenty-four solar terms, and it is the fourth solar term in spring. The solar longitude reaches 0 degrees, and the solar term is celebrated on March 19~22 of Gregorian calendar every year. The vernal equinox is of great significance in astronomy, and the northern and southern hemispheres are equally divided day and night. After that, the direct position of the sun continued to move from the equator to the northern hemisphere, and the days in the northern hemisphere began to be longer than the nights.

The first solar term in Tomb-Sweeping Day is one of the vernal equinox, vernal equinox and twenty-four solar terms, and it is the fourth solar term in spring. The solar longitude reaches 0 degrees, and the solar term is celebrated on March 19~22 of Gregorian calendar every year. The vernal equinox is of great significance in astronomy, and the northern and southern hemispheres are equally divided day and night. After that, the direct position of the sun continued to move from the equator to the northern hemisphere, and the days in the northern hemisphere began to be longer than the nights. The vernal equinox also has obvious characteristics in climate. It's warm, rainy and sunny at this time.

Twenty-four solar terms are the product of ancient farming civilization in China, and the traditional division of four seasons began with "four stands". In the historical development, cultural exchange and communication, four solar terms (vernal equinox, autumnal equinox, summer solstice, winter solstice) reflecting the return movement of the direct point of the sun were all over the pre-Qin period. The division of the four seasons in the west is based on the dichotomy, that is, spring is divided into beginning of spring. The vernal equinox in the "vernal equinox" is also the New Year of Uzbekistan, Turkey, Afghanistan, Iran and other countries, with a history of more than 3,000 years.