What do the solar terms "Sanjiu" and "Jiu Si" mean?

"March 9" and "April 9" refer to the third and fourth cold days from winter to Sunday, which is the coldest period of the year. The specific calculation method is: from the winter solstice, every "nine" is counted as a "nine", the first nine days are called "one nine", the second nine days are called "two nine", and so on, the third nine days and the fourth nine days of "three nine". I've been counting the "Ninth Five-Year Plan" for 81 days. At this point, the cold has gone and the weather is getting warmer.

The date of the winter solstice is 65438+February 2 1-23 in the Gregorian calendar every year, counting from the date of the winter solstice to the 81st day of "99". Because of China's vast territory, the climate varies greatly from place to place, not all over the country. Only some areas in China correspond to the number 9 "998 1 day, 900 peach blossoms, deep in spring and warm in the day".

Extended information 99 ballads:

/kloc-no shooting in 0/929, on the ice in 3949.

In 5969, I saw the willows by the river, in 79, I opened the river, and in 89, the geese came.

99 plus 19, plowing cattle everywhere.

Explanation:

After the winter solstice, the weather gets cold, and people don't want to be cold outside for the first two to nine days. On the third or fourth day, the river freezes and people can walk.

On the fifth and sixth days, the temperature rises, the willows by the river turn green, the river melts in July and September, and the geese return from the south in August and September.

On the ninth nine days, that is, after 8 1 day, spring returns to the earth and crops can be planted.