When did September 19 start?

Counting from the winter solstice. It is coldest in winter.

Enter "No.9" from the date of winter solstice. "Counting Nine" is a folk solar term in winter in China. From winter solstice to Sunday, it is called "Jiujiu", every nine days, the first nine days, the last nine days, and so on, until the ninth nine days, the number reaches 998 1 day.

People think that March 9 is the coldest day, but in fact, April 9 is the coldest time in winter. It was only a few days before March 9 that the temperature changed greatly, and suddenly it became cold, so the body did not adapt, so it was particularly cold. On April 9, although the temperature was lower than that on March 9, the temperature difference changed little, and it didn't feel as cold as when it entered March 9 from February 9.

Extended data:

There are many customs of "counting nine", among which "Jiujiu Song" is the most extensive and has a long history. These songs skillfully use the phenological phenomena in nature and vividly reflect the laws of weather changes during the Ninth Five-Year Plan period.

As far as most parts of China are concerned, the weather was not the coldest when the 29th passed, but "1929, I can't reach it." At the end of April 9, it was almost the "Great Cold" solar term, so we said "March 9, freezing cats and dogs".

After May 9, the earth gradually rejuvenated and the weather gradually warmed from cold, so "May 969, look at the willows by the river; 7989, walking alone. " By 1999, it was already a "thunder" solar term, so the thunder of 1999 made a lasting noise.