What does spring rain mean in Qingxi Valley astronomy?

"Spring begins with spring, and the valley is clear"-the word "clear" in this paper refers to the "clear" solar term.

The spring rain surprised the spring and the valley. Refers to spring: beginning of spring, rain, sting, vernal equinox, Qingming, Grain Rain. Six solar terms.

Full text:

The spring rain shocks the spring and the valley, and the summer is full of mountains and summer heat.

Autumn dew, autumn frost, little snow in winter and cold in winter.

The two festivals remain unchanged every month, with a maximum difference of one or two days.

June 2 1 day in the first half of the year, and August 23 in the second half.

Summer: long summer, small full, mangzhong, summer solstice, big trees, small trees;

Autumn: beginning of autumn, early summer, Bailu, autumnal equinox, cold dew and early frost;

Winter: beginning of winter, light snow, heavy snow, winter solstice, slight cold and severe cold.

This is a 24-year-old solar term song, written for the convenience of remembering 24 solar terms. Among them, two solar terms remain unchanged every month, that is to say, 24 solar terms are evenly distributed in 12 months of a year, with two solar terms per month, neither more nor less. June 2 1 day in the first half of the year, and August 23 in the second half. This means that the first half of the solar term is the 6th and 2 1 of each month, and the second half is the 8th and 23rd of each month.