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What do the last two sentences of the solar term Song mean?

The last two sentences of the 24 solar terms Song Dynasty:

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

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

Full text:

The spring rain shakes the spring and clears the valley, and the summer is full of mountains and summers.

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.

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

Other versions:

The sun is shining in beginning of spring, it rains by the river, and crows are awakened. The land is dry at the vernal equinox, and Qingming is busy sowing wheat, while Grain Rain is sowing fields.

Long summer goose feathers live, birds are full, awn seeds shovel, and cotton is not picked from summer to day. The heat is not hot, but it is dog days.

Beginning of autumn busy playing indigo, summer knife sickle, white dew smoke shelf, the autumnal equinox, cold dew is not cold, the first frost weather.

In the early winter of October, light snow freezes, heavy snow falls on the branches of the river, and there is no boat on the solstice in winter. The slight cold is near the twelfth month, and it is cold for a whole year.

Extended data

The origin of the 24 solar terms: The 24 solar terms were concluded in ancient times. The rotation of the Big Dipper is closely related to the change of seasons: "bucket handle refers to the east, and the world is spring; Bucket handle guide, the world is summer; Bucket handle refers to the west, and the world is autumn; Bucket handle refers to the north, and it is winter all over the world. "

In ancient times, bucket handle's direction-the Big Dipper was used as the standard to judge the season, which was called sword fighting, also known as Jian Yue. Bucket handle revolves around the east, south, west and north, which is called one of the "years old" (Figure). It began in the beginning of spring and ended in the great cold.

In BC 104, taichu calendar written by Deng Ping absorbed 24 solar terms as a supplement to the calendar. Based on the Yellow River Basin. Divide the year into 24 segments, about 15 days. The current 24 solar terms come from the fixed solar terms law formulated more than 300 years ago, that is, the time when the sun runs along the ecliptic from zero 15 degrees is called "a solar term".