What is Geng Day?

In ancient society, after careful study and research, the ancients invented the chronology of cadres and branches. Heavenly stems and earthly branches consists of ten heavenly stems and twelve earthly branches, and it is dominated by sixty sons. Among sixty jiazi &; The third watch refers to the three encounters from the summer solstice. G & Word, the third Geng Day is what we often say now, indicating that it is the hottest time. Because it is a dry day, there is a Geng Day every ten days, just like Geng Zi Day, Geng Yin Day, Chen Geng Day and so on. And because a year, whether it is 365 days or 366 days, is not an integer multiple of 10, the change of Geng day is uncertain. Maybe this year's day is, but next year's day is not. Just like there is February 29 this year, there will be no next year. It is precisely because of the fluctuation of Geng Day that the date of entering the first stage in summer is different every year, but on the whole, it will not be much different.

People often say: the heat is at three volts, and the cold is at three or nine. The dog days are the hottest period in a year, which can be divided into three days: the beginning, the middle and the end. According to the distance of the sun's revolution from the earth, the length of day and night varies from year to year. After the vernal equinox, the days are long, the nights are short, and the summer solstice, the sun is close to direct. The summer solstice is not very hot. Although the ground absorbs a lot of heat, it usually dissipates at night. As summer enters the state, the heat accumulated on the ground gradually increases, the intensity of the sun gradually increases, and the solar terms we are in gradually enter the dog days.

After the summer solstice, the third Geng day is the first day of winning, and the fourth Geng day is the first day of winning. Since then, beginning of autumn's first Geng Day is the first day of the last day. By the end of summer, the heat had almost disappeared. Although it is still very hot, it is much better than the dog days. In calendars and solar terms, the first day and the last day share 10 days, and the number of days in between is very uncertain. Because from the summer solstice to beginning of autumn, the number of Gengri days is different, sometimes four, sometimes five. When there are four Geng days, the midsection lasts for ten days, and when there are five Geng days, the midsection is longer and twice as long, with twenty days.

From the summer solstice, the sun began to move gradually to the equator. The closer to the equator, the more obvious the phenomenon of short days and long nights. V & means summer, that is to say, hot ingredients are mixed with cold. People often use the dog days to express the climate characteristics of midsummer, but few people notice that the third watch also means this. The expression dog days appeared very early in China, and it has a long history. After all, the Chinese nation is the oldest nation in the world. Back in the Qin Dynasty, people called the hottest time of the year dog days.

Having said that, I believe everyone has a better understanding of Gengri, and some people may suddenly realize that it is dog days again, so hot. It is said every year that it is really surprising that the dog days are so close to Geng Day. Some people may be very vague about these two concepts, which will be enlightening after today's talk. In either case, as long as you really learn something, it is excellent.