In the 24 solar terms table, what does it mean to come in the first half and come in the second half?

"The first half of the year is June 2 1 day, and the second half is August 23" means that most of the solar terms in the first half of the year are on the 6th and 2nd1day of each month, and most of the solar terms in the second half are on the 8th and 23rd of each month.

Analysis: This is the date of calculating solar terms according to the solar calendar. The lunar calendar has 24 solar terms every year, and the lunar calendar has two solar terms every month.

Twenty-four solar term song

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.

Six 21s in the first half of the year and eight 23s in the second half.

Extended data:

The origin of the twenty-four solar terms

The solar terms 1 and 24 originate in the Yellow River Basin. Four solar terms were established in the Spring and Autumn Period: midsummer, midsummer, midsummer and winter solstice. After continuous improvement and perfection, by the Qin and Han Dynasties, the 24 solar terms had been completely established.

In BC 104, taichu calendar written by Deng Ping and others formally defined the 24 solar terms and determined their astronomical positions.

2. The time when the sun runs along the longitude of the yellow sun 15 degrees from 0: 00 is called "a solar term". It runs 360 degrees every year and experiences 24 solar terms twice a month.

3. Among them, the first solar term of each month is "solar term", namely, beginning of spring, Jingzhe, Qingming, Changxia, Mangzhong, Xiaoshu, beginning of autumn, Bailu, Hanlu, beginning of winter, Xueyu and Xiaohan, with a total of 12 solar terms.

The second solar term of each month is "Zhong Qi", namely: rain, vernal equinox, Grain Rain, full moon, summer solstice, intense summer heat, intense heat, autumnal equinox, first frost, light snow, winter solstice and severe cold. "Solar terms" and "central solar terms" alternate once every 15 days, and now people call them "solar terms".