How many days does Zhongfu have?

The number of days in midsummer is different every year.

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. Every Geng day is 10 day.

The time from the beginning of lodging to the middle lodging is 10 day, and the last lodging is 10 day. Summer may be 10 days, or 20 days, because when there are four Geng days between the summer solstice and the beginning of autumn, it is 10 days, and when there are five Geng days, it is 20 days.

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According to China's traditional calculation method, the third and fourth Geng days from summer to the future are the first (head) and middle start dates respectively, and the first Geng day after beginning of autumn is the last first day.

Because every Geng day is 10 days apart, the stipulated time of the first day and the last day is 10 days. Because the third Geng day (the first autumn) after the summer solstice solar term appears sooner or later, the number of days in autumn is long or short, which may be 10 or 20 days.