What happened to the 24 solar terms?

Generally, these solar terms are calculated according to the lunar calendar, and kilometers are different from the lunar calendar. February 9th of this year is the vernal equinox. I suggest you read a perpetual calendar or a book about the interpretation of the twenty-four solar terms.

For example, the twenty-four solar terms originated in the Yellow River Basin. As early as the Spring and Autumn Period, the ancient sages of China set four solar terms, namely, mid-spring, mid-summer, mid-autumn and mid-winter, and constantly improved and perfected them. By the Qin and Han Dynasties, the 24 solar terms had been completely established. In BC 104, the taichu calendar written by Deng Ping officially set 24 solar terms in the calendar, and defined the astronomical position of the 24 solar terms. Twenty-four solar terms are the original cultural heritage of working people in China, which can reflect the changes of seasons, guide agricultural activities and affect the daily life of thousands of households.

The vernal equinox, which means that day and night are equally divided, ranks among the four solar terms. At this time, the equatorial sunshine is direct, the spring blossoms, the birds are singing and the flowers are fragrant, and the vegetation grows, which is suitable for farming and field management; Sightseeing, traveling, etc.

Vernal equinox calculation [Y*D+C]-L

Interpretation of the formula: the last two digits of the year are multiplied by 0.2422 plus 20.646, and the leap year is subtracted from the integer, and the c value of 2 1 century vernal equinox is 20.646.

For example, the date of 1992 vernal equinox = [92× 0.2422+20.646]-[92/4] = 42-23 = 19, and March19 is the vernal equinox.

Exception: calculation result in 2084 plus 1 day.