"Slight cold and severe cold, cold without wind", severe cold is the last of the 24 solar terms. On Gregorian calendar 1 20th of the month or 2 1 day, when the sun reaches 300 degrees of the yellow meridian, it is a severe cold. "Give time to test the weather" quoted from "Three Rites and Righteousness": "The great cold is the middle one, rising above the slight cold, so it is called great, and the extreme cold is called great cold." Great cold means that the weather is extremely cold. Twenty-four solar terms originated in the Yellow River Basin. In BC 104, taichu calendar, written by Deng Pingping, officially set the 24 solar terms in the calendar.

The story of the great cold solar terms: It is said that there was a rich boy who was ignorant and ignorant in ancient times. He was rich at home but did nothing. Every day, I only know how to eat, drink, and have fun. After a long time, I ate up all my family's industries. I have no choice but to borrow money from my relatives.

After a long time, all his relatives have been borrowed by him. On the first day of the first month of this year, the black sheep wanted to ask his uncle for clothes to pawn, but he thought that his uncle had nothing to give but a cotton-padded jacket. He has no nerve to ask for more.

In February, the black sheep of his family was still thinking about his uncle's cotton-padded jacket, but his uncle said, "On February 28th, chickens and ducks were frozen to death.". I still didn't borrow it.

In March, my uncle sent him away with a sentence "March 3, freezing bachelor".

It's April, and it's getting warmer, so I can't believe my uncle said "April 20, frozen branches".

In May, the black sheep of his family went again, and my uncle replied, "You can't send cold clothes after eating May Zongzi."

It was hot in June, and my uncle threw him another sentence, "People are not caterpillars, but they are afraid of the cold north wind in June."

It was very hot in July, and the black sheep found his uncle to borrow a cotton-padded jacket. My uncle said, "I ate my meal in July and a half, and let my son go to Dipo Station", which means it's going to be cold.

In August, the black sheep of his family went to see his uncle again. My uncle said, "On August 15th, the wild geese opened their doors and brought frost on their heads." It began to frost. You can't borrow your coat either.

Every sentence in the short story reveals a solar term, which has profound implications. Great cold is the last of the 24 solar terms in the whole year. Although the weather is still cold at this time, it is the end of winter. There is a vague feeling of spring.

Extended data:

The cold welcomes the new year. It refers to the period from the beginning of the Great Cold to the Lunar New Year, when every household begins to be busy with the New Year. There will be a series of activities among the local people. Generally speaking, there are ten major customs, namely, eating glutinous rice, drinking porridge, binge drinking, making teeth, sweeping the dust, pasting windows, steaming for offering, rushing to get married, going to the market and bathing. All the activities are for a good start in the coming year, which reflects people's yearning for a better life.