How to calculate the dog days?

How to calculate the dog days? The date of dog days is calculated according to the calendar of trunk and branch. The dog days are divided into three days: the beginning, the middle and the end. The first day is the third Geng day from summer to the future in the 24 solar terms of the lunar calendar, the middle day is the fourth Geng day in ChangXia Hou, and the whole day is the first Geng day after beginning of autumn.

There is no fixed time for accommodation every year, and the length of accommodation is different. You need to consult the almanac to calculate, but you can calculate the date of stay by remembering the formula "Three Geng from summer to Sunday".

The dog days are characterized by the hottest weather all year round, not only that, but also the wettest and sultry weather with low air pressure and low wind speed.

In ancient China, ten heavenly stems (A, B, C, D, E, Ji, G, Xin, Ren and Gui) and twelve earthly branches (Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai) were used to mark the sun, that is, heavenly stems and earthly branches was used to match 60. The day with the word "Geng" is called Geng Day.