What does middling mean?

Middle volt, also known as three volts, is a concept of traditional Chinese medicine, which refers to the three hot periods in summer.

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Middling, that is, the second volt of "three volts", is the fourth Geng day from summer to the first Geng day after beginning of autumn. The number of midsummer days is long or short, which may be 10 day or 20 days, depending on the date of the third Geng day (first fall) after the summer solstice solar term every year. The climate of "dog days" is characterized by "high temperature and high humidity", because the southeast wind blows in dog days, the air is humid, and the humidity of the wind causes great humidity in dog days.

In dog days, "high temperature and high humidity" is the climate characteristic of southern China. Midvoltage is the second volt of "three volts". "V" means being forced to hide underground. Three volts can be divided into initial volts, intermediate volts and final volts, and their dates are determined by the coordination of solar terms and solar terms in the dry branch calendar. The fourth Geng day solstice after long summer begins on the first Geng day after the beginning of autumn, which is the second volt of the three volts, generally 10 day.

Some years are 20 days. Three volts, the initial, middle and final volts, is the hottest season of the year. The dog days appear in the Gregorian calendar from mid-July to mid-August every year, and its climatic characteristics are high temperature, low pressure, high humidity and low wind speed. According to the traditional calculation method in China, from the summer solstice, according to the dates of trunks and branches, the third Geng day is the first, the fourth Geng day is the middle, and the 1 th Geng day after beginning of autumn is the last. Every Geng day is 10 day.

The time from the beginning of lodging to the middle lodging is 10 day, and the last lodging is 10 day. Summer may be 10 days, or 20 days, because when there are four Geng days between the summer solstice and the beginning of autumn, it is 10 days, and when there are five Geng days, it is 20 days. The dog days are the hottest, wettest and sultry time of the year. The reason for the high humidity in dog days is that the southeast wind blows in dog days, and the Pacific Ocean and Indian Ocean are in the southeast direction. The air is humid, and the humidity of the wind causes the high humidity in the dog days.

In dog days, "high temperature and high humidity" is the climate characteristic in the south of China, while "high temperature and dryness" occurs in the north. The second of the three volts. Also called two volts. Usually refers to the fourth Geng day from summer to the first Geng day after beginning of autumn.