1 1 Is it autumn or winter?
In modern astronomy, the spring equinox (March 20th or 2 1), summer solstice (June 2nd1or 22), autumn equinox (September 22nd or 23rd) and winter solstice (June 65438+February 2nd1or 22) are four seasons.
Autumn climate: Autumn after beginning of autumn means that precipitation and humidity are at the turning point of the year, and there is a downward or decreasing trend; 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 is gradually declining, the yin is gradually flourishing, the climate turns from hot to cold, and everything is born with cold and gradually declines. This 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.