What do you mean, it's best to stay close to the fire in cold weather, and don't open the door if you have nothing to do?

It's best to stay close to the fire in cold weather, and don't open the door if nothing happens.

Great cold is the last of the 24 solar terms, and there is a saying that "Great cold welcomes the New Year". It's ugly, the solar longitude reaches 300, and it's celebrated every year at 65438+1October 20th to 2 1 day. Great cold, like slight cold, is also a solar term indicating the cold weather. Great cold refers to extremely cold weather. During the great cold solar term on March 9 and April 9, cold waves frequently go south, which is the coldest season in a year, with strong wind and low temperature.

According to China's long-term meteorological records, there is no slight cold in the great cold solar terms in the northern region; But for most parts of the south, it is really the coldest solar term. In ancient China, the Great Cold was divided into three stages: "One stage is chicken milk; Second, the symptoms of bird disease; Three times, the water is strong. " Among them, the third period can especially show that the temperature of the great cold is extremely low: at this time, the ice in the water can freeze to the center of the water, and it is thick and firm.

Changes of solar terms in severe cold;

During the severe cold solar term, the atmospheric circulation is relatively stable, and the adjustment period of circulation is about 20 days. When this circulation is adjusted, there will often be a wide range of rain and snow weather and strong winds to cool down. When the west of 80 degrees east longitude is a long wave ridge and East Asia is a coastal trough, under the influence of the northwest wind and the constantly supplemented cold air, China will have a sustained low temperature.

Like slight cold, great cold is also a solar term indicating the degree of cold weather. Modern meteorological observation records show that in some areas of China, severe cold is not as good as slight cold, but in some years and a few coastal areas, the annual minimum temperature will still appear in the severe cold solar terms. Therefore, it is necessary to continue to do a good job in the cold protection of crops, especially to protect livestock from wintering.