"Half of spring in the middle equinox, half of spring today Feedback." Beijing time on March 20, 11:06 will usher in the spring equinox. At this time of the festival, the spring river is warm, the smoke and willow green, peach blossom red, pear white, warbler twirls, swallow flying, full of spring color, a faction of vitality.

When the sun reaches 0 degrees of the yellow longitude, the fourth spring equinox comes, marking the day and night equalization, is the entire spring in the "C" season.

Folklore scholars, Tianjin Academy of Social Sciences researcher Wang Laihua introduction, nine nine songs in the "nine nine plus one nine, plowing oxen all over the ground," referring to the spring equinox. Vernal equinox, "the ground has been through", that is, the permafrost layer has thawed, the soil permeability is good, it is a good time to sow seeds.

Vernal equinox is one of the twenty-four solar terms that is particularly valued. Ancient Chinese people talked about "spring prayers and autumn reports", that is, in the spring plowing to pray for rain and wind, the fall harvest to pray for a good harvest.