What does "June 21st in the first half of the year and August 23rd in the second half of the year" mean in Twenty-four solar term song?

The so-called six twentyones in the first half and eight twentythree in the second half means: 65438+10-June is the first half; July -65438+ February is the second half year. Every 6th and 2 1 day in the first half of the year must be a solar term, and the 8th and 23rd of each month in the second half of the year are a solar term. There is usually a difference of one or two days. (all are Gregorian calendars)

Twenty-four solar term song

Spring rains excite spring and clear valleys, and summer is full of mountain heat.

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

The two festivals are the same every month, with a difference of one or two days at most.

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

Spring: beginning of spring, rain: rain, fright: fright, spring: vernal equinox, sunny: Qingming, valley: Grain Rain.

Summer: long summer, full: Xiao Man, awn: awn seed, summer: summer solstice, summer even: light summer and great summer.

Autumn: beginning of autumn, location: summer, dew: white dew, autumn: autumnal equinox, cold: cold dew; Health, first frost.

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

Twenty-four solar terms are the product of ancient farming civilization. It occupies an extremely important position in the traditional farming culture of China. It is the product of long-term observation and research on astronomy and meteorology by ancient people in China, and it contains the long-standing cultural connotation and historical accumulation of the Chinese nation.

Among the 24 solar terms, there are both phenological changes between cold and summer, and high and low moderate 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 ancient people's food, clothing, housing and transportation, and even cultural concepts.