2. The almanac says that "the bucket refers to the white dew, the yin is getting heavier, and the mausoleum is the dew, so it is named the white dew." Entering the Millennium, the most obvious feeling is that the temperature difference between day and night is large, and it will feel a little cold at night. Although the summer heat may not leave at once, the sultry feeling will gradually fade away, adding a coolness of autumn in the morning and evening. As the weather turns cold, the sun is still hot during the day, and the sun returns to the mountains, and the temperature drops rapidly. White dew, the summer heat gradually disappears, the yin of heaven and earth rises and disperses, the night gets colder, the temperature difference between day and night widens, and the cold produces dew condensation, which is one of the reasons for "white dew".