What is the meaning of spring rain, spring and bright valley days?

Beginning of spring, rain, fright, vernal equinox, Qingming and Grain Rain are six solar terms.

The phrase "Spring Rain Begins Spring Valley Clearing Day" is the first sentence of the 24 solar terms in Song Dynasty, which means the six solar terms of beginning of spring, rain, sting, vernal equinox, Qingming and Grain Rain.

Twenty-four solar terms Song summed up the names of the twenty-four solar terms by rhyming, which is convenient for people to remember their names, sequences and seasons.