What do the last two sentences of the solar term Song mean? "The first half of the year is June 2 1 day, and the second half is August 23."

"Come on June 2 1 day in the first half of the year and August 23/day in the second half of the year" means that the solar terms in the first half of the year are around the 6th and 2 1 day of each month, and in the second half, around the 8th and 23rd of each month.

Solar term song is a poem written to facilitate people to understand the laws of solar terms. The full text is as follows:

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

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

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

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

The first four sentences of "solar term song" are composed of one word in each solar term in order, which is the main body of the whole solar term song, while the last four sentences are the time laws of the 24 solar terms. That is, in the first half of the year, the solar terms are around the 6th and 2 1 of each month, and in the second half, around the 8th and 23rd of each month.

As a supplementary calendar in ancient China, the 24 solar terms play an extremely important role in the traditional farming culture of China, and are the products of long-term observation and research on astronomy and meteorology by the working people in ancient China, which contains the long-standing cultural connotation and historical accumulation of the Chinese nation.

In the twenty-four solar terms, there are not only phenological changes between cold and summer, but also changes in temperature and rainfall. Through it, the ancients can intuitively and clearly understand the changing law of seasonal climate in a year, so as to master the farming season and arrange farming activities reasonably. It not only plays a guiding role in agricultural production, but also affects the food, clothing, housing and transportation of ancient people, and even cultural concepts.