What is the meaning of "May 9th" in the calendar?

In China, there are not only lunar calendars and solar calendars, but also dry calendars (also called lunar calendars). Every year, the winter solstice in the 24 solar terms begins to count nine, and it really enters the cold weather. The so-called nine is nine days and nineteen, so there are nine nines, which are called nineteen, twenty-nine, three-nine, four-nine, five-nine, six-nine, seven-nine, eight-nine and nine-nine.

In Jiuli, the degree of cold is explained by Jiujiu songs.

If you can't reach out in September and September, you can walk on the ice in March and April, talk about rivers in May and September, and see willows along the river in July, September and August. In 998 1 year, the scalpers all went to the fields (meaning they began to farm). 99 poplars fell to the ground, and 19 apricot blossoms were in full bloom. China is a vast country with different temperatures, so folk proverbs are different.

That's what you mean when you say "May 9th" in the calendar.