What is the meaning of solar terms and vernal equinox?

The meaning of the solar term vernal equinox is: the seasons are equally divided, and the day and night are equally divided.

First of all, "vernal equinox" has two detailed meanings. One is "season sharing". Traditionally, spring is between beginning of spring and Long Summer, and the vernal equinox is in the two solar terms, which just divides spring equally. Another meaning is "equal day and night". At the vernal equinox, the sun shines directly on the equator, and the length of day and night is equal, each being 12 hour.

The climate of the vernal equinox is characterized by warm and sunny weather. At this time, China folks have the custom of flying kites, eating spring vegetables and laying eggs.

The vernal equinox is around February 15 of the lunar calendar every year (about March 20 -2 1 in Gregorian calendar), when the sun is located 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.

Second, the phenology of vernal equinox and solar terms: mysterious bird, Ye Yan, high temptation: "The vernal equinox comes and the autumn equinox goes."

Thunder is sound: yin and yang are thin, which is thunder. At this time, the four yang gradually flourished, and there was still yin, so the sound was fine; Yes, the rhyme club said, "It is difficult to exhale like gas." Shu Zhu said: "hair, still out."

Electricity: electricity, sunlight; The four yang are flourishing, and the gas is exhausted and the light is born. Therefore, "Li Jie" said: "All voices are positive; It's just yang. " "Yi" said: "Thunder and lightning are combined into one chapter. "

"Biography of the Ram" also said: "Electricity, Lei Guang." Yes, Xu said, "Thunder is the sun, and electricity is cloudy." Not exactly. It is obvious that there is electricity without thunder in midsummer.