What solar term has passed? It's really cold.

After the first frost, the weather turned cold and began to frost.

The first frost is one of the 24 solar terms of the lunar calendar. Entering this solar term, the weather is getting colder and frosty. The first frost is usually around Gregorian calendar1October 23rd 10 every year. At this time, the first frost appeared in the Yellow River basin in China, and most areas were busy planting crops such as three wheat.

Every year, around Gregorian calendar 10 year 10 23rd, when the sun reaches longitude 2 10 degrees, it is the first frost. The first frost said that the weather was colder and the dew condensed into frost.

Extended data:

The origin of the first frost solar terms

Every year around Gregorian calendar 10 year 10, when the sun reaches the longitude of 2 10 degrees, it is the first frost in the 24 solar terms. The first frost is the last solar term in autumn, which is the transition from autumn to winter.

There is a lot of heat dissipation on the ground in autumn, and the temperature suddenly drops below 0 degrees. Water vapor in the air directly condenses on the ground or plants to form fine ice needles, and some become hexagonal frost flowers, which are white and loose in structure.

"Twenty-four solar terms" said that the first frost: in mid-September, the gas was cold and condensed, and the dew became frost. "First frost" means that the weather is getting colder and the dew condenses into frost. In ancient China, the first frost was divided into three stages: first, the jackal sacrificed animals;

Second, the vegetation is yellow; Three stings are salty. The jackal began to catch prey, sacrifice animals, and sacrifice to heaven to repay the kindness of animals, paving the way for sacrificing autumn gold; The leaves on the earth turned yellow and fell; The stinging insects are motionless in the cave and hang their heads into hibernation.

Reference source: Baidu Encyclopedia-First Frost