When is the vernal equinox of 202 1?

The solar terms of 202 1 vernal equinox are 2021March 20th 17: 37: 19, Saturday, the eighth day of February.

The vernal equinox is one of the earliest solar terms among the 24 solar terms. The earliest solar terms in China were only two vernal equinoxes (vernal equinox and autumnal equinox) and two solstices (winter solstice and summer solstice), which was the result of the ancient people's measurements of the sun's shadow.

People calculate the shadow of the sun and find that the vernal equinox is as long as day and night, then the days become longer and the nights become shorter. The vernal equinox is like the beginning of a cycle, pushing up the valve of yang. The vernal equinox is a very important solar term, and it is a season in which yin and yang are balanced, day and night are equal, and the four seasons are half cold and half warm.

Extended data

From vernal equinox to cold;

With the arrival of the vernal equinox, the weather is no longer cold, the shock has passed, and most areas have ushered in a bright spring. At this time, day and night are equal, but they can't completely relax, and there is still the possibility of cold spring. During the vernal equinox, the daily average temperature in all parts of China rose steadily to above 0℃ except the alpine mountain area and the area north of 45 north latitude.

At this time, the cold has passed and the temperature has risen rapidly, especially in North China and Huanghuai Plain. The daily average temperature rises to above 10℃ almost at the same time as the rainy areas along the Yangtze River and the south of the Yangtze River, entering a bright spring. On the vast land, on the bank of willow green, the grass grows in Fei Ying, the wheat is jointing, the rape blossoms are fragrant, the peach blossoms are red, and Li Bai is coming in spring. South China is a scene of late spring.