What are the characteristics of the vernal equinox in the 24 solar terms of a year?

The characteristics of vernal equinox in the 24 solar terms of a year: day and night are equally divided, each being 12 hours. In ancient times, beginning of spring and Changxia were regarded as spring, and the vernal equinox was in the middle of three months in spring, and the spring was equally divided. The vernal equinox is a period in which yin and yang are balanced, day and night are equal, and cold and summer are equally divided.

The vernal equinox begins on March 20th or 2 1 every year and ends on April 4th or 5th. The vernal equinox begins on March 20 or 2 1 day of the Gregorian calendar every year, and the sun reaches 0 degrees of the yellow meridian (vernal equinox). The length of day and night is average, just half of the 90th day of spring, so it is called "vernal equinox".

After the vernal equinox, swallows will fly from the south, and when it rains, the sky will thunder and lightning. The vernal equinox is an important solar term, which not only has astronomical significance, but also has obvious characteristics in climate. At the vernal equinox, China entered a bright spring except the Qinghai-Tibet Plateau, Northeast China, Northwest China and North China.