Division method of twenty-four solar terms

The twenty-four solar terms reflect the annual apparent movement of the sun, which is only related to the solar calendar. According to the position of the sun, the solar year is divided into 24 solar terms, which reflects the hot and cold climate change in summer and facilitates family activities.

According to the position of the sun on the ecliptic (the earth's orbit around the sun, that is, the annual movement route of the sun) and the order that causes the evolution of the ground climate, it divides the whole year into 24 segments, each of which is separated by about half a month (15 days), and each segment is called a solar term. The first month of each month is called "solar terms", including beginning of spring, Jing Zhe, Qingming, Changxia, Mangzhong, Xiaoshu, beginning of autumn, Bailu, Hanlu, beginning of winter, heavy snow and slight cold. Those in the middle of the month are called "Zhong Qi", including rain, vernal equinox, Grain Rain, Xiaoman, summer solstice, great heat, early summer, autumn equinox, early frost, light snow, winter solstice and severe cold. The twenty-four solar terms are 12 solar terms and 12 qi.