The vernal equinox | the fourth day of the first half of spring The spring color is exactly in the middle of the equinox

Chengdu, March 20 (Reporter Chang Sirong Intern reporter Huang Xuesong) The spring equinox is the fourth of the twenty-four solar terms. "The spring equinox, yin and yang are half, so the day and night are even and the cold and summer are flat." This day is halfway through spring, with the sun directly above the equator and lasting 12 hours each day and night.