What do you mean by seven or nine days?

Seven or nine days refers to the seventh nine of the lunar calendar.

The ancient people of our country have smart wisdom and creativity. Astronomical geography has summed up a set of very scientific calculation rules based on years of practice, which has provided great help to people's life and production.

Among them, the number nine refers to nine consecutive days, which refers to the coldest time in winter in a year, and the number seven nine is the seventh nine in the index nine.

Twelve festivals:

Beginning of spring, Jingzhe, Qingming, Changxia, Mangzhong, Xiaoshu, beginning of autumn, Bailu, Hanlu, beginning of winter, heavy snow and slight cold.

Twelve qi:

Rain, Spring Equinox, Grain Rain, Xiaoman, Summer Solstice, Great Summer, Early Summer, Autumn Equinox, Early Frost, Light Snow, Winter Solstice, Great Cold.

"Festival" and "Qi" appear alternately, each lasting about 15 days, which are collectively called "solar terms".

The twenty-four solar terms of the lunar calendar reflect the visual movement of the sun in one year and are an inseparable part of the lunar calendar.