What is the formula of Jiujiu?

The formula of 99 is as follows: 1929, I can't reach it, 3949, frozen bitch, 5969, watching willow by the river, 7989, walking alone, 99 hearing thunder, and the noise is lasting.

China folk customs, starting from the solstice in winter, are called "September 9th" every nine days until "September 9th", * * * 8 1 day, which is a cold period of the year. "99", also known as "99 in winter", is a folk solar term in winter in China. "Counting Nine" begins on the second day of "Winter Solstice" in late December of the lunar calendar every year. There are many customs of "counting nine", among which "Jiujiu Song" is the most extensive and ancient.

These folk songs skillfully use natural phenomena and vividly reflect the law of weather changes during the Ninth Five-Year Plan period. As far as most parts of China are concerned, the weather after September 29th is not the coldest, but "1929, I can't reach it". /kloc-at the end of 0/949, it was almost a "severe cold" solar term, so it was said "3949, frozen bitch".

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.

Calculation method:

The correct algorithm of "counting nine" begins from winter to the first nonunion day in the future. Therefore, the specific date of "September" every year is not fixed, depending on the first nonyl day after the winter solstice.

Another mistake is that the number nine is counted from the winter solstice, so the specific time of "nine" is a fixed time every year from the winter solstice, and each "nine" is fixed on the ninth day, the18th day and the 27th day after winter. The "nine-counting" algorithm from the date of winter solstice is wrong.