Is it a whole year from the annual light snow festival to the next light snow festival?
24 solar terms is divided according to the position of the sun on the ecliptic (that is, the earth's orbit around the sun). Depending on the sun starting from the vernal equinox (longitude zero, at this moment the sun shines vertically on the equator), every advance of 15 degrees is a solar term; After running for a week, I returned to the vernal equinox, which is a tropical year, 360 degrees, divided into 24 solar terms, twice a month. It reflects the annual apparent movement of the sun, so the date of solar terms is basically fixed in the current Gregorian calendar, with the first half of the year being 6 days and 2 1, and the second half being 8 days and 23 days, with a difference of 1 ~ 2 days.
Therefore, from this point, we can clearly analyze that although the 24 solar terms came from ancient China, their algorithms are basically consistent with the existing solar calendar. According to the position change of the sun on the ecliptic and the evolution order of the ground climate caused by it, the whole year is accurately divided into 24 equal parts, and each equal part is named.
The meaning of light snow solar terms
In "Twenty-four Solar Terms", the explanation of Xiaoxue solar terms is "Fifteen days after beginning of winter, bucket handle refers to Hai, that is, Xiaoxue. It rained in the middle of October (lunar calendar) and was cold and thin, so it condensed into snow. The words of the villain are not prosperous. " 1mid-October, the rain was about to fall but was invaded by cold air, so it solidified into snow.
When there is light snow, it generally begins to snow in northern China, and the amount of snow is limited, which also reminds people that it has entered the season of keeping out the cold and keeping warm. Like other solar terms, the light snow solar term has three periods, when the rainbow disappears; Second, the weather is rising and the atmosphere is falling; Third, the weather was blocked and turned into winter.
The disappearance of the rainbow means that the rainbow can't be seen after the light snow solar terms. Rainbow is formed by the refraction of sunlight by countless water droplets in the air after rain. After the light snow solar term, the temperature plummeted, the rain turned into ice and snow, and the rainbow naturally did not appear.
Second, the weather rises and the atmosphere drops. At this time, everything is dying, and there is no trace of green. Third, winter is blocked, indicating that winter has really arrived. The weather is getting colder every day, and the river begins to freeze. Every household closes the door to prevent cold air from entering the room.