What do winter snow and winter mean in the 24 solar terms?

Among the 24 solar terms, the snow in winter in Song Dynasty is light snow in beginning of winter, and the snow in winter is heavy snow and winter solstice.

The spring rain shocks the spring and the valley days, the midsummer is full, and the summer heat is connected. The first frost and autumn dew are autumn, the winter snow is small and the winter is cold. The first half of the year is June 2 1, and the second half is August 23. Set two dates every month, with a maximum difference of one or two days.

Twenty-four solar terms originated in the Yellow River Basin. As early as the Spring and Autumn Period, four solar terms were set: midsummer, midsummer, midsummer and midsummer. After continuous improvement and perfection, by the Qin and Han Dynasties, the 24 solar terms had been completely established.

In BC 104, the Calendar written by Deng officially listed the 24 solar terms in the calendar and determined their astronomical positions.

Starting from the zero point of the sun meridian, every 15 degree along the meridian is called a solar term. It runs 360 degrees every year and experiences 24 solar terms twice a month.

Among them, the first solar term of each month is "solar term", that is, beginning of spring, Jingzhe, Qingming, Changxia, Mangzhong, Xiaoshu, beginning of autumn, Bailu, Hanlu, beginning of winter, Heavy Snow, Xiaohan, etc. 12 solar terms.

The second solar term of each month is "Zhongqi", that is, there are 12 solar terms such as rain, vernal equinox, Grain Rain, Xiaoman, summer solstice, summer, long summer, autumnal equinox, first frost, light snow, winter solstice and great cold.

Solar terms and neutral qi alternate, each lasting 15 days. Now people call solar terms and neutral gases solar terms.

The twenty-four solar terms reflect the apparent movement of the sun in a year, so the date of the solar terms is basically fixed in the current Gregorian calendar. The first half of the year is the 6th and 2nd1,and the second half is the 8th and 23rd, with a difference of 1-2 days.