Has the weather become warmer since spring?
After beginning of spring, the weather didn't get warmer immediately, and cold remained the mainstream. There may be some preheating during this period, but it is not the final preheating time. Twenty-four solar terms think that winter ends around "fright".
In the Gregorian calendar, winter ends around the beginning of March. It probably won't get cold if you are scared. On the solar calendar, it is the beginning of March. Therefore, after beginning of spring, every family should not think that the sunshine is just right and the temperature rises rapidly, so they should add or subtract clothes at any time and keep warm. After "beginning of spring", the intersection and stalemate of cold and warm air will easily lead to low temperature and rainy weather. "chilly spring" refers to the weather at this time.
Therefore, although the overall temperature is rising, the temperature changes obviously, the rainfall increases, and the climate is changeable, which is easy to cause diseases such as upper respiratory tract infection. Pay attention to adding and subtracting clothes in time and exercise to enhance physical fitness. As far as meteorology is concerned, the average daily temperature for five consecutive days exceeds 10℃, which means that spring has come in the sense of meteorology.
When did spring begin?
Twenty-four solar terms are the most solar terms in the world. It is formulated directly according to the laws of the movement of the sun (actually, the revolution of the earth). Intuitively, each solar term corresponds to the height of the fixed sun. From the perspective of modern science, each solar term corresponds to an exact point on the earth's orbit around the sun.
So when you see beginning of spring in one place, the height of the sun is the same at noon every year; Sunrise and sunset are the same time. The earth is also this point on the orbit of beginning of spring's revolution every year, which is called the beginning of spring point.