How to calculate when it falls?

The annual squatting time is not fixed, and the length of squatting time is different, so you need to check the almanac to calculate it. To put it simply, the lodging date can be expressed by the formula of "Three Geng in Summer", that is, from the third Geng Day in Xia Hou, the first lodging is 10 day, the middle lodging is 10 day or 20 days, and the last lodging is 10 day. In ancient China, the method of "counting days by branches" was popular, and 65,438+00 days and 65,438+02 plots were used to record 60 groups of different days for recycling.

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From what date?

An ambush is entering the dog days. There is a folk saying that "early autumn occurs in summer solstice", which is the basis for establishing early autumn. The almanac stipulates that "the summer solstice sunset is on the third Geng day", which means "counting down from the summer solstice" and then falling asleep 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 on June 2 1 day, the first boxer day on June 202 1 day, the second boxer day on July 1 day and the third boxer day on July1day. So entering the Japanese army in 202 1 year began in July 1 1.