What's the date from May 9th to May 9th?

May 9th is a solar term in China's "Nine Numbers". See willows along the river in May 969, and May 98 is usually a few days between October and February. Jiujiu, also known as Winter Jiujiu, is a folk solar term of the Han nationality. Count nine cold days, that is, from the solstice of winter, count a "nine" every nine days until the "99" of 81 days, and the weather will warm up.

In China, there are not only lunar calendars and solar calendars, but also dry calendars (also called lunar calendars). Every year, the winter solstice of the twenty-four solar terms begins to count nine, and it really enters the cold weather. The so-called nine is nine days and nine years, which are called 19, 29, 39, 49, 59, 69, 79, 89 and 99 respectively.

Extended data:

Every year, the first day of the winter solstice is the ninth National Day, and the ninth National Day is ***8 1 day. Because the winter solstice is basically on February 22nd of 10 every year, the date of "Jiujiu" is basically fixed. 1929 didn't shoot, walked on the ice in 3949, watched the willows crossing the river in 5969, opened the river in 79, brought geese in 89, and added 19 in 99, plowing cattle everywhere.