0 1, slight cold and severe cold

Slight cold means that the weather is cold, but it has not reached the extreme, so it is called slight cold.

The meaning of slight cold: China's climate began to enter the coldest period of the year.

Great cold means: it is extremely cold, and the weather is very cold.

Moral of the Great Cold: The coldest period of the year is coming.

02, the difference between slight cold and severe cold.

1 After the winter solstice, the direct point of sunlight will gradually move northward, but for a period of time afterwards, the direct point of sunlight will always be in the southern hemisphere, and the heat in the northern hemisphere will always be lost, and the heat absorbed during the day is still less than the heat released at night. Therefore, after the winter solstice, the temperature in the northern hemisphere continues to decrease, and slight cold and severe cold become the two coldest solar terms in a year. As the saying goes, "It's 239 when it's a slight cold, and it's so cold that it shakes.". This shows the cold degree of the slight cold solar terms.

2. Every year, around 1 20th of the month, when the sun reaches 300 degrees of the yellow meridian, it is a severe cold. The ancients thought that the "heaven" of alternating cold and summer heat was to recover quickly after cold. If you had a severe cold before a slight cold, you could not find the feeling of "recovering" after the coldest, so you put the severe cold behind you and let it return to beginning of spring. This is in line with the way of "extremes meet". There is also a saying that the slight cold in winter corresponds to the "slight heat" in summer, so it is called "slight cold"; The severe cold in winter just corresponds to the "great summer heat" in summer, so it is called "great cold".