Twenty-four solar terms-vernal equinox
At the vernal equinox, the feet of rain fall gently,
The oblique wind on Lu 'an brought the guests home.
It's getting late in the north,
You know, there is a green waist fat.
? At the vernal equinox, yin and yang are equally divided. So it's cold and hot day and night? . One? Integral? Words tell the boundaries between day and night, cold and hot. At this time, the longitude of the sun is 0 degrees and the position of the sun is above the equator. Recorded in the lunar calendar book? Fighting refers to the vernal equinox, which is about Sunday, and the northern and southern hemispheres are equally divided day and night, which is also half of spring, hence the name vernal equinox. ? The vernal equinox is the midpoint of 90 days in spring, and the northern and southern hemispheres are equal in day and night. From this day on, the direct position of the sun gradually moved northward, and the length of day and night in the northern and southern hemispheres also changed. The northern hemisphere has long days and short nights, but the southern hemisphere is just the opposite. As soon as the spring equinox arrives, the rainfall increases obviously, and the national average ground temperature has stabilized at 10 degrees, which is the spring temperature defined by climatology. Ouyang xiu also had a wonderful description of the vernal equinox:? Mid-spring in Nanyuan, the wind and the smell of Ma Si, green plums like peas and willows, butterflies flying. ? No matter north or south, the vernal equinox and solar terms are good times for spring.