What does it mean to be cold for a thousand years? Is autumn the beginning or the end?

Bailu is the15th solar term among the 24 solar terms in China, and many different cultures have been formed in the continuous development and changes of Bailu solar terms. What does a cold night in the Millennium mean? Is the Millennium the beginning or the end of autumn?

What does it mean to be cold for a thousand years? Specifically, the temperature difference between day and night in the Millennium is getting colder every day.

Entering the Millennium, the temperature difference between day and night is large, and I will feel a little cold at night, obviously feeling that the cool autumn has arrived. During the Millennium, summer monsoon was gradually replaced by winter monsoon, cold air turned to attack, and warm air gradually retreated. Cold air going south in batches will often bring a certain range of cooling. People like to use the proverb "it's cold in the autumn night in the white dew" to describe the situation that the temperature drops rapidly.

Is the Millennium the beginning or the end of autumn? It is neither the beginning nor the end, and it is the third solar term in autumn.

Millennium is the third solar term in autumn. The solar terms in autumn are beginning of autumn, Chushu, Bailu, Autumnal Equinox, Cold Dew and First Frost.

In the Millennium, the longitude of the sun is 165 degrees, which is around September 7 of the Gregorian calendar. Dew is a unique natural phenomenon after the dew festival. At this time, at night, Yin Qi is getting heavier and heavier, and water droplets formed by water vapor condensation can be seen everywhere on the vegetation, hence the name Millennium. It is recorded in the Book of Rites that the weather is cool at this time, dew falls and cicadas sing. The solar term with the largest temperature difference between day and night in the Millennium is generally around 10℃. At this time, the big airflow began to change from the summer wind direction to the winter wind direction, and the cold air in the northern region obviously began to invade frequently. In addition, the position of direct sunlight on the ground moves south, and the sunshine time in the northern hemisphere is getting shorter and shorter, which leads to a rapid drop in temperature.