How to understand the weather characteristics of vernal equinox?

The direct sunlight of vernal equinox and autumnal equinox is on the equator, the direct sunlight of summer solstice is on the tropic of cancer, and the direct sunlight of winter solstice is on the tropic of cancer.

The vernal equinox is the midpoint of 90 days in spring. One of the twenty-four solar terms, every year on February 15 of the lunar calendar (about March 20 -2 1 of the Gregorian calendar), when the sun is located at 0 (vernal equinox) of the yellow meridian. 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. The vernal equinox is a new year in Iran, Turkey, Afghanistan, Uzbekistan and other countries, with a history of 3,000 years.

Twenty-four solar terms: "in mid-February, half a minute, that is, half of 90 days, so it is called minutes." Autumn is synonymous. " "Spring and Autumn Stories Yin and Yang in and out" said: "The vernal equinox, Yin and Yang are also half-phase, so it is cold and summer day and night."

The vernal equinox is also a festival and ritual celebration. The ancient emperors had a system of offering sacrifices to the sun in spring and the moon in autumn. The ritual of the Zhou Dynasty was to offer sacrifices on the altar. "Twenty-four solar terms": "In the middle of February, it is divided into half, which is half of 90 days, so it is called minutes." Another article, Spring and Autumn Stories, Yin and Yang in and out, said: "At the vernal equinox, Yin and Yang are also half-phase, so day and night are cold and summer."

Folk activities are generally considered as the official start of an outing. Activities include: flying kites, women and children flying kites, writing blessings on kites, hoping that God will see them. When drinking, men, women and children spend a lot of money. Picking wild vegetables in the wild, Zhu's Spring Miscellaneous Books: I'm not in the mood to write or play the piano.