Why is the first day of February called Jiujiu?

The first day of February this year is also the "September 9" in the 99 solar terms. According to the old custom, the 99 solar terms are also called "Counting Nine".

Nine-nine songs circulated in the ancient Central Plains: Don't shoot guns in 1929, walk on the river in 3949, watch willows along the river in 5969, talk on the river in 79, geese come in 89, and plow cattle everywhere in 999.

The concrete meaning of counting nine songs

Nine Songs is a ballad that reflects the solar terms in winter. It takes nine as the unit, and there are nine nines, totaling 8 1 day. It describes the natural change from cold to warm in winter.

Since the ninth day, the weather has become so cold that people can only put their hands in their pockets; In 3949, it was the coldest day in winter, and even the water in the river was frozen into ice, so people walked on the ice without much problem. In May, 1969, the weather gradually warmed, and all the willows along the river sprouted.

When the ice of the 79 River melts into water, the water begins to warm. On August 9, the swallows flew back from the south, which was a lively scene; 1999, people began to work in the fields and prepare for farming. In ancient times, people used Niu Gengdi, so they could plow cattle everywhere.