A poem describing the extension of days in spring.

The Vernal Equinox written by Heshui Zuo.

Wind and thunder send warmth into mid-spring, and peaches and willows dress up every day.

The equatorial golden sun shines directly on the earth's surface, evenly divided day and night.

Equinox: It is the midpoint of 90 days in spring. One of the 24 solar terms in a year. 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 south are opposite to those in the northern hemisphere. When the northern hemisphere is vernal equinox, the southern hemisphere is autumnal equinox. In Iran, Turkey, Afghanistan, Uzbekistan and other countries, the vernal equinox is the New Year. The word vernal equinox has two meanings in the concept of time: first, it refers to the whole solar term of vernal equinox, and the time is 15 days. The second is the vernal equinox, which is the first day of the vernal equinox and the midpoint of the whole spring time.