The first "winter" in "Dong Xue Xue Dong Xiao Da Han" in the solar terms song refers to the Beginning of Winter solar term. Beginning of Winter is one of the 24 solar terms in the lunar calendar and is also one of the traditional Chinese festivals. The time is between November 7 and 8 of each year in the Gregorian calendar. After Beginning of Winter, the sunshine hours will continue to shorten and the height of the sun at noon will continue to decrease. Chinese folk regard Lidong as the beginning of winter.
Twenty-Four Solar Terms Song: The spring rain shocks the spring and clears the valley, and the summer is full of awns and the summer heat is connected. There is dew in autumn, cold frost in autumn, and snow in winter and slight severe cold in winter. The Song of the Twenty-Four Solar Terms is a short poem compiled to facilitate the memory of the twenty-four solar terms in the ancient Chinese calendar and has been passed down to this day. Solar terms refer to the twenty-four seasons and climate. They are a supplementary calendar established in ancient China to guide farming. They are the crystallization of the long-term experience and wisdom of the working people in ancient China.
The Beginning of Winter is the nineteenth of the twenty-four solar terms in the lunar calendar. In astronomy, "Beginning of Winter" is regarded as the beginning of winter. According to climatology, the start of winter in my country has to be delayed by about 20 days. At the beginning of winter, the sun has reached 225 degrees longitude. The northern hemisphere where we are located receives less and less radiation from the sun. However, since the heat stored on the surface in the second half of the year still has a certain amount of energy, it is generally not too cold yet. But the temperature gradually dropped. When the weather is clear and windless, there is often a sunny, warm and comfortable October "Indian Spring" weather.