The dog days begin from summer to the third Geng day, usually in the middle of July in the solar calendar.

"Three volts" is a general term for initial, middle and final volts. From mid-July to mid-August, the number of days is 30 or 40. According to the laws of the lunar calendar, the date of lodging can be determined by the formula of "Xia San Geng Day", that is, from the date of summer, the third Geng Day is the date of lodging. The * * * is 10 day.

Gengri is an auspicious day with the word "Geng", such as Gengzi, Gengyin and Chen Geng. Because there are 10 days, there will be a Geng day every 10 days.

The first day of the last autumn is the first Geng Day after beginning of autumn, and the number of days is also 10.

Lodging metaphase refers to the day before the fourth Geng day from summer to the first Geng day after beginning of autumn. Due to the different Geng day time, the lodging time is not fixed, some years are 10 days, some years are 20 days, and this year the lodging time is 20 days.

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