How is the sum of one volt, two volts and three volts calculated?

The calculation method of one volt, two volts and three volts in summer is as follows:

"Fu" is also called "Changxia", and the five elements call it "Earth". Spring, summer, long summer, autumn and winter are five seasons in a year, which can naturally circulate according to the symbiotic relationship between wood, fire, earth, gold and water. Autumn belongs to "Geng Xin Gold", so "ambush" should start from "Geng Day".

In ancient China, the "trunk-branch calendar" was popular, and 60 groups of different names were used to record dates with 10 heavenly stems and 12 earthly branches, which were recycled. The day with the word "Geng" is called "Geng Day". The word "Geng" in Geng Day is the seventh word in "A, B, C, D, E, Ji, G, Xin, Ren, Gui" 10 day, and it is repeated every 10 day.

The temperature is the highest, and it needs to be hidden for 20 days from summer to the future. To put it simply, we can use the formula of "Xia San Geng" to express the lodging date, that is, from the third Geng day in Xia Hou, the initial lodging is 10 day, the intermediate lodging is 10 day or 20 days, and the final lodging is 10 day.

Starting from the summer solstice, according to the date of trunk, 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. The length of accommodation is not fixed every year, and the length of accommodation is also different. It needs to be calculated by consulting the almanac. If Geng Sunrise occurs in beginning of autumn and two days later, the lodging days are 10 days, otherwise, the lodging days are 20 days.