Beginning of spring, Changxia, beginning of autumn and beginning of winter, why are they called Sili?

Standing, it means starting. According to the method of dividing seasons in ancient Chinese astronomy, beginning of spring, Changxia, beginning of autumn and beginning of winter are beginning of spring, long summer, beginning of autumn and beginning of winter respectively, that is, from independent spring to long summer as spring, from long summer to beginning of autumn as summer, from the beginning of autumn to the beginning of winter as autumn, and from the beginning of winter to the beginning of spring as winter. Therefore, these four solar terms are collectively called "four stands".

On February 4th every year in beginning of spring, the sun reaches 3 15. Standing means "start"; Spring represents warmth and growth. The beginning of spring represents the beginning of a new year, bringing everything back to life.

In the long summer, the sun reaches 45 every year around May 5 of the Gregorian calendar. Astronomically, Chang Xia said that bidding farewell to spring is the beginning of summer. When the temperature rises obviously, the summer heat comes, thunderstorms increase and crops enter the peak season, people are used to taking long summer as an important solar term.

Every year in beginning of autumn, around August 7th in the Gregorian calendar, the sun reaches longitude 135. "Autumn" means cool in summer. When we arrived in beginning of autumn, the phoenix tree began to shed its leaves, so there is an idiom "Autumn is known by falling leaves". Autumn is the transitional season when the weather turns from hot to cold, and then from cold to cold.

Every year, beginning of winter is around Gregorian calendar 1 1.7, and the sun is at 225. Li also means that winter begins. Winter means the end, which means that the crops should be harvested after harvest. China regards beginning of winter as the beginning of winter.