When did Sanjiu begin?

Sanjiu begins on 19 days after the winter solstice.

Three or nine days means the third "nine days" from the winter solstice, that is, 19-27 days after the winter solstice. China lunar calendar uses "99" to calculate seasons. The winter solstice is the first day of "19 days", and every 9 days is a "9". The first nine days are called "19", the last nine days are called "29" and so on. "99" 81days later, winter ends and spring enters, and the coldest period of the year is.

March 9 refers to the third cold day since the winter solstice, which is the coldest period in a year. The specific calculation method is: from the winter solstice, every "nine days" is counted as a "nine", the first nine days are called "one nine", the last nine days are called "two nine", and so on, and the coldest periods in a year are "three nine, four nine".

39-day phenomenon

The so-called "dog days are hot, March 9 is cold", and the coldest time of the year is from March 9 to April 9. "Nine peach blossoms bloom", the cold dissipates and the weather gets warmer. There is also a saying that "1999, 1999, there are cattle everywhere". After 1999, "the spring is deep and the sun is warm", and the spring ploughing season has arrived. Because of China's vast territory, the climate varies greatly from place to place, not all over the country.

The date of the winter solstice is 65438+February 2 1-23 in Gregorian calendar every year. From the day of the winter solstice, the Ninth Five-Year Plan is pushed by 8 1 day, that is, in late March (around the vernal equinox) of the Gregorian calendar, peach blossoms are in full bloom and spring flowers are in full bloom, which only corresponds to parts of southern China. Around the vernal equinox, many places in China are still gloomy and cold.

The above content is referenced from Baidu Encyclopedia-Sanjiutian