What solar term does the sunny day on September 9 refer to?

1999 sunny days generally refer to shocking solar terms.

Because the number of nine means that every nine days from the winter solstice is September 19, and March 9 and April 9 are the coldest times of the year, but by the ninth day, it is already the season of "fright", and with spring, the sun is shining high.

Frightening solar terms are of great significance in busy farming. Since ancient times, the working people in our country have attached great importance to the solar term of fright and regarded it as the day when spring ploughing began. There is a cloud in the Tang poetry: "A light rain brings new flowers, and a thunder starts. Tian Jia was idle for a few days, and farming began. "