What do you mean by 6: 21 in the first half and 8: 23 in the second half?

Most of the solar terms in the first half of the year are on the 6th and 2 1 of each month, and most of the solar terms in the second half are on the 8th and 23rd of each month. This is based on the solar calendar, and the lunar calendar has 24 solar terms every year and two solar terms every month, so the first half of the year is June 2 1 day, and the second half is August 23, which 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. Twenty-four solar terms originated 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.