The poem of dividing eggs in spring?

The poem "The Equinox Egg" is as follows:

Equinox-Xu Xuan

On the fourth day of mid-spring, spring scenery is in the middle. Green fields go around the moon, and clear clouds are intermittent.

I still swallow, and the flowers have fallen. The tall buildings are late and the songs are inaudible.

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The fourth day of February coincides with the vernal equinox solar terms; Spring is just over half. On the green field, the moon lingers slowly; In the mysterious sky, clouds are floating intermittently. Swallows fly by; Flowers fall one by one. Thinking of women in tall buildings and watching the end of the world, it's getting late; The song floating in the distance is too sad to listen to. On the whole, these poems vividly describe the scene of the vernal equinox.

Introduction of vernal equinox:

The vernal equinox is one of the 24 solar terms and the fourth solar term in spring. The fingers do not match, the longitude of the sun reaches 0, and the festival is held on March 19-22 of the Gregorian calendar every year. The vernal equinox is of great significance in astronomy. On this day, the northern and southern hemispheres are divided equally day and night. Since then, the direct position of the sun has continued to shift from the equator to the northern hemisphere. The days in the northern hemisphere are longer than the nights, while the southern hemisphere is the opposite.

Climatically, there are also obvious characteristics. In addition to the Qinghai-Tibet Plateau, Northeast China, Northwest China and North China, China has entered a beautiful spring.

The vernal equinox refers to the position of the sun between 0 degrees and 15 degrees of the yellow meridian during the period from March 20th to April 5th. But in fact, it usually refers to the day when the sun is really at 0 degrees of the yellow meridian: March 20 or March 2 1.