When did the ambush start?

1, crouching, indicating dog days. There is a folk saying that "the three gengzi heads fall on the summer solstice", which is the basis for establishing the first autumn. The almanac stipulates that "the number of volts starts from the third day of the summer solstice", that is to say, "the countdown starts from the summer solstice" and begins to fall on the third "Geng Day". The "Geng Day" here refers to the days prefixed with "Geng" in the ancient "Ganzhi Jiri Law". For example, the summer solstice boxer day on June 2 1, the first boxer day on June 202 1, the second boxer day on July 1, and the third boxer day on July 1 1, so 202/kloc.

2. The length of stay is not fixed every year, and the length of stay is also different. You need to look up the almanac to calculate. We can simply use the formula of "the third boxer in the summer solstice" to express the lodging date, that is, from the third boxer day after the summer solstice, the initial lodging is 10 day, the intermediate lodging is 10 day or 20 days, and the final lodging is 10 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.