What is the vernal equinox called? Why is it different every year?

What are the nicknames of the vernal equinox?

In ancient times, it was also called Japan-China, Day and Night, and Mid-Spring Moon. There's a cloud in "Medicine Taste Tong Guayan": There is a strong wind in beginning of spring and a cool breeze in spring. Day and night are divided equally, and the direct point of the sun is on the equator. As a solar term that divides spring equally, the climate at this time is characterized by the germination of everything, the elongation of crops and the vitality of everything, which can be described as a prosperous spring.

Why is the date different every year?

Because the 24 solar terms are defined according to the position of the earth in the orbit around the sun, they belong to the solar calendar. The revolution of the earth around the sun is 360 degrees, 0 degrees at the vernal equinox, 15 degrees at Qingming, and then every 15 degrees is a solar term, and its date is basically fixed in the solar calendar. And our commonly used calendar shows that there are 365 days in a year, but in fact the earth needs 365.256 days. In order to eliminate the error, humans introduced the leap year method, and the leap year is 4 years and 366 days, so this will happen. There will be a deviation of several hours in this comparison, so the dates are different. It is more appropriate for us to understand the solar terms as specific time points.

What's the meaning?

Because it is the season when everything grows, everything brings new hope, people's mood is also happy, they will act neatly and concentrate on their work. In the folk, people hold various sacrificial activities to pray for more rain and harvest. In their spare time, adults and children like to fly kites in the open space, lay eggs and eat eggs according to customs, and travel for an outing. Besides, large-scale farming and irrigation can also be carried out in southern China.