Cold and summer are peaceful, full of poems day and night.

The whole poem is peaceful in cold and summer, even day and night, and the autumnal equinox is half yin and yang. When the golden wind brings coolness, you feel that osmanthus fragrance is everywhere. Yan zhen arranges Chinese characters in the south sky, and maple leaves dye dresses from the sunset. It's a pity that its moments of beauty are boring, so trust your feelings to the cloud carefully.

The autumnal equinox is the sixteenth of the twenty-four solar terms in the lunar calendar. China's ancient book "The Spring and Autumn is Full of Dew, Yin and Yang Come in and Out" says: The autumn equinox, Yin and Yang are half-phase, so it is cold and summer day and night. The autumnal equinox means "half" Gregorian calendar is from September 22nd to 24th every year.

Just like the vernal equinox, the sun is almost direct to the equator, and the length of day and night is equal again. It can be said that the autumnal equinox is a very special day. From this day on, the position of direct sunlight continued to move from the equator to the southern hemisphere, and the northern hemisphere began to have shorter days and longer nights. "Twenty-four solar terms" said: "Autumn equinox, mid-August. See the vernal equinox. "

Three stages of the autumnal equinox:

At first, the thunder stopped. The ancients thought that it thundered because the yang was strong and the yin began to flourish after the autumnal equinox, so it stopped thundering.

Second, the insect is a blank household. The mud of household tile is bad, and so is the fine mud. "Book of Rites" says that the bad acupuncture points make the light slightly smaller and sheltered when it is cold. The dormant insects began to hide in the cave and sealed the hole with fine soil to prevent the cold from invading.

After three waits, the water began to dry up. "Book of Rites" Note: Water is the original qi, and the qi in spring and summer lasts for a long time, and the qi in autumn and winter is exhausted. Due to the dry weather in autumn and the rapid evaporation of water, lakes and rivers will face a dry situation.