Spring rains startle spring, and it's sunny in the valley. What is the solar term in the second spring?

The second spring in "Spring Rain Begins Spring, Valley Clearing Day" refers to the "vernal equinox".

The vernal equinox is the fourth of the 24 solar terms and an important season for farming. The sun shines directly on the equator of the earth, and day and night are almost equal. In ancient times, it was spring from beginning of spring to long summer, and the vernal equinox was in the middle of three months in spring.

When the vernal equinox comes, the rainfall increases obviously, and the national average ground temperature is stable above 10 degrees, which is the spring temperature defined by climatology. However, after the spring equinox and solar terms, the climate is mild, the rain is abundant and the sun is shining. Winter crops in most parts of China enter the spring growth stage, which is also the sowing time of early rice.