How to write the introduction of autumnal equinox and solar terms?

The autumnal equinox solar terms are introduced as follows:

The autumnal equinox is the sixteenth solar term among the twenty-four solar terms and the fourth solar term in autumn. On the day of the autumnal equinox, the sun shines almost directly on the equator of the earth, and the length of day and night is equal all over the world. The autumnal equinox means "equal share" and "equal share". Besides dividing the day and night equally, the autumnal equinox is just in the middle of 90 days in autumn, which means "dividing equally", so it is called autumnal equinox.

According to the lunar calendar, "beginning of autumn" is the beginning of autumn, and "first frost" is the end of autumn. The "vernal equinox" is only half the distance from beginning of autumn to the first frost. The autumnal equinox used to be a traditional "Moon Festival", but now the Mid-Autumn Festival comes from the traditional autumnal equinox "Moon Festival". According to textual research, the Mid-Autumn Festival was originally set on the day of the autumnal equinox, but because this day is not always a full moon, the Mid-Autumn Festival was later transferred from the twenty-four solar terms of the autumnal equinox to the fifteenth day of the eighth lunar month.

From the day of the autumnal equinox, the climate has three main characteristics: the direct sunlight continues to move from the equator to the southern hemisphere, and the phenomenon of shorter days and longer nights in the northern hemisphere will become more and more obvious, with shorter days and longer nights; The temperature difference between day and night gradually increases. After the autumnal equinox, the direct sunlight moves south, the days in the northern hemisphere become shorter, the nights become longer, and the temperature drops, which is of universal significance throughout the country.

At the autumnal equinox, the Yangtze River basin and its vast areas north of China all entered the autumn divided by "climatic average temperature", and the daily average temperature dropped below 22℃. The cold air mass in the north began to have some influence. The rainy season has just ended in most areas, with a cool breeze blowing gently. Autumn is crisp and the sky is high and the clouds are light.

After the autumnal equinox, the direct sunlight moved to the southern hemisphere, and the northern hemisphere got less and less solar radiation, but the ground lost more heat and the temperature dropped significantly. As the agricultural proverb says, "An autumn rain leads to a cold", "Autumn dew divides the night, and the night is cold".