In autumn, the solar altitude angle decreases gradually, and the temperature decreases gradually from heat; The autumn wind is cool, the summer heat is gone, the fruits are covered with branches, and the fields are golden.
Autumn wind is a natural wind in autumn, which is different from spring breeze, Xia Feng breeze and winter breeze. There are many meanings, including desolation and helplessness, which are very common in poetry. The autumn wind solar term is also an important solar term in agricultural production. After the autumn wind, the direct position of the sun moved to the southern hemisphere, and the northern hemisphere got less and less solar radiation, while the ground lost more heat, and the temperature dropped significantly faster.
Agricultural proverb says: an autumn rain, a cold, a white dew, an autumn night, a cold night, the wild goose opens in August, and frost comes to the feet of wild geese.
Related introduction:
It is autumn in beginning of autumn so far, which means that precipitation and humidity are at the turning point of the year, and there is a tendency to decrease or decrease. In nature, everything begins to grow from lush to rich and mature. Autumn is the harvest season, and many plants mature in autumn. In autumn, in nature, the qi of yin and yang begins to change, the yang gradually declines, the yin gradually grows, the climate turns from hot to cold, and everything is born with cold.
Gradually falling, it is the season of alternating hot and cold. As the temperature gradually drops, the leaves of many deciduous perennial plants will gradually change color, wither and fall off, leaving only branches for winter.
Panicum miliaceum will come to the end of his life, wither and die. Seasonal variation covers many aspects of climate characteristics, and it is not accurate to judge autumn only by temperature. The most obvious change in autumn is that the leaves of vegetation change from lush green to yellow, and the leaves begin to fall and the crops begin to mature.