The important symbol of the beginning of the fourth season is

Are you asking about the important symbol of the beginning of the four seasons? Beginning of spring, Changsha, beginning of autumn and beginning of winter reflect the changes of the four seasons in the "twenty-four solar terms".

These four solar terms are collectively referred to as Sili. According to the method of dividing seasons in ancient Chinese astronomy, four seasons are the beginning, with independent spring to long summer as spring, long summer to beginning of autumn as summer, beginning of autumn to beginning of winter as autumn, and winter solstice to beginning of spring as winter. Standing, it means starting. So the four solar terms refer to beginning of spring, long summer, beginning of autumn and beginning of winter.