What is the vernal equinox in the 24 solar terms?

As we all know, there are 24 solar terms in China, four seasons a year, three months in spring, summer, autumn and winter, and two solar terms every month, each of which has its own unique meaning. The vernal equinox is one of the 24 solar terms, and the time is March 20-22 in the Gregorian calendar. Many people don't know which vernal equinox is in 24 solar terms, so I'll introduce it to you today.

What is the vernal equinox in the 24 solar terms?

The vernal equinox is the fourth of the 24 solar terms. According to the lunar calendar, "it refers to the vernal equinox, which is about Sunday. The northern and southern hemispheres are equally divided day and night, which is also half of spring, so it is called the vernal equinox." From this day on, the direct position of the sun gradually moved northward, and the length of day and night in the northern hemisphere also changed. The northern hemisphere has long days and short nights, but the southern hemisphere is just the opposite.

At the vernal equinox, the sun is directly above the equator, and the duration of day and night is almost equal, each being 12 hour. After the vernal equinox, the position of the sun gradually moved northward, and the days began to get longer and the nights began to get shorter. Therefore, the vernal equinox was also called "Japan-China", "Day and Night Equinox" and "Midspring Moon" in ancient times. The significance of the vernal equinox has two aspects. One is to divide the day and night equally. Second, in ancient times, it was spring from beginning of spring to long summer, and the vernal equinox happened to be in the three months of spring, and spring was equally divided.

At the vernal equinox, theoretically, the world is as long as day and night (see the dawn). After the vernal equinox, the days in the northern hemisphere are getting longer and shorter, and the nights in the southern hemisphere are getting shorter and shorter. At the vernal equinox, there are no extreme days and nights in the world. After the vernal equinox, it began to be extremely daytime near the North Pole, and its scope gradually expanded. Near the Antarctic, the extreme day ends and the extreme night begins, and the scope gradually expands.