How many solar terms are there in our traditional calendar year?

According to the laws of seasonal change and climate change, the ancients divided 365 days and 1/4 days of a solar year into 24 solar terms, such as beginning of spring, rain and fright. These solar terms are divided equally first, and each solar term averages 15.22 days. According to the speed of the sun's movement, some later generations stipulated 14 days (for example, from winter to around), and some stipulated 16 days (from summer to around). The names and order of the 24 solar terms are as follows:

The first month: rainy in early spring, February: vernal equinox, March: Qingming Grain Rain, April: long summer and small man, May: summer solstice in Changmang, June: mild heat, July: intense heat in early autumn, August: white dew and autumn equinox, September: early frost and cold dew, 10: light snow in early winter.

This set of solar terms first appeared in Huainanzi Astronomical Training. Jing Ke was called "Qi Zhe" in ancient times, but Jing Di's name was taboo in Han Dynasty. The collocation of 24 solar terms and months is not absolutely fixed. Because the solar term follows the solar year, it has nothing to do with the new moon.

The ancients originally divided the twenty-four solar terms into solar terms and neutral gas. For example, beginning of spring is in the first month, the rain is in the first month, the fright is in February, the vernal equinox is in the middle of February, and so on. The subdivision of solar terms has a certain relationship with leap. Because it takes about 30.5 days to add 1 solar terms and 1 neutral gas, which is longer than a new moon, the solar terms and neutral gas in each month will be delayed by 1 to 2 days compared with the previous month, and only the solar terms will be delayed to a certain month, and then this month will be a leap. So the ancients said, "leap month is not neutral."

The solar calendar has solar terms and a neutral atmosphere every month. The 6th and 2 1 in the first half of the year are festivals, and the 8th and 23rd in the second half of the year are festivals.