What does the northeast vernal equinox mean?

The vernal equinox is the midpoint of 90 days in spring and one of the 24 solar terms. Every year on March 20th of the Gregorian calendar, when the sun is at 0 (vernal equinox) of the Huangjing. On the vernal equinox, the sun shines directly at the equator of the earth, and the seasons in the northern and southern hemispheres are opposite. The northern hemisphere is the vernal equinox and the southern hemisphere is the autumnal equinox.

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The vernal equinox was also called "Japan-China", "Day and Night Equinox" and "Midspring Moon" in ancient times. "Li Mingshi Yi" said: "The dividing line, the turn of Huang Chi, the sun stops here, and the day and night are equally divided." Therefore, the significance of the vernal equinox, first, refers to the equal division of day and night, each of which is 12 hours; 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.

The corresponding phenological phenomenon in the ancient Yellow River basin is "the arrival of a mysterious bird, the thunder and the electricity" (see "Nongsang Tongzhi"). At this time, the overwintering crops in most parts of China entered the spring growth stage. A farmer's proverb in central China says, "Wheat rises at the vernal equinox, which is a worthwhile moment." The vernal equinox is also a traditional festival. In the Zhou dynasty, there was a ceremony to worship the sun at the vernal equinox.

The Chronicle of Jingchu in Liang Zonggu of the Southern Dynasties records: "On the day of the vernal equinox, people planted fire-fighting grass on their houses. If there is a bird like a blackbird, the rooster will crow first and the door frame will creak. When people wait for the bird, they will go into the field and think they will wait. " In the Ming Dynasty, planting trees in Zichuan, Shandong Province, brewed spring wine to cool off the heat. "Wenshui County Records" contains: "On the vernal equinox, the wine is cold and the flowers move."

In ancient China, the vernal equinox was divided into three periods: "First, waiting for the arrival of birds; Second, wait for Lei Nai to make a sound; Third, wait for electricity. " In other words, after the vernal equinox, swallows will fly from the south, and when it rains, the sky will thunder and lightning. The vernal equinox is recorded in the ancient calendar of China: "Three days before the vernal equinox, the sun entered the equator".

References:

Baidu encyclopedia vernal equinox