When did 202 1202 1 enter the city?

1, 202 1 after entering the city, the summer solstice is June 2 1, and July 2 1 after the third day of March is the first day of entering the city. It is divided into three stages: the beginning, the middle and the end. Generally, mid-July to mid-August is the hottest time of the year. The length of accommodation in dog days is not fixed every year, and the length of accommodation is also different.

2. At present, there are two versions about the time of 202 1, one is 202 1 July, and the other is 202 11July. This is related to the algorithm of "Xia San Geng Day", which is the third Geng Day since summer.

3. Because the summer solstice of 202 1 falls on June 2 1 day, this day is Wu Jiayue's boxer day according to the calendar. If this day is also boxer day, the accommodation time is July 1 1. Gengri refers to the day when the word "Gengzi" is used to support auspicious days.