What does the vernal equinox mean? Brief introduction of vernal equinox and solar terms.

1, the vernal equinox is the midpoint of 90 days in spring. Every year on March 20th of the Gregorian calendar, when the sun is 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 one of the 24 solar terms and a traditional festival. In the Zhou dynasty, there was a ceremony to worship the sun at the vernal equinox. Book of Rites: "Altar." Confucius' Ying Da Shu: "Also called the vernal equinox." This custom has been handed down from generation to generation. On the day of vernal equinox, the sun shines directly on the equator, and the length of day and night is almost equal, which is exactly half of the 90th day of spring, so it is called "vernal equinox". After that, the direct sunlight position gradually moved northward, and the days began to get longer and the nights began to get shorter.