Every solar term is many days.

There are 354 or 355 days in a normal year, 383 or 384 days in a leap year and 24 solar terms in the lunar calendar.

The number of days between festivals is different.

Because the number of days in the lunar calendar is about eleven days worse than that in the solar year, seven leap months were set in nineteen years.

From summer to the future, the third Geng day began to become the first Geng day, and the fourth Geng day was the middle one.

The first Geng Day after beginning of autumn is the last day (dog days).

Every 10 day * * * 30 days. "In some years, the midrange is 20 days, while * * * is 40 days.

Winter solstice enters the ninth day, and there are nine days every nine days. Of course, the solstice 18, the third nine days after entering beginning of winter.