[Q] In the micro-headline just issued, you proposed: During the Xia and Shang Dynasties, the royal family used the midnight sun realm, and the folk used the sunrise sun realm. The use of sunrise sun boundary is well understood because of ancient farming

[Q] In the micro-headline just issued, you proposed: During the Xia and Shang Dynasties, the royal family used the midnight sun realm, and the folk used the sunrise sun realm. The use of sunrise is easy to understand, because ancient farmers were "working at sunrise, sunrise and resting" - when a new round of sun rises, farmers begin a new day's labor. The people of an agrarian society would naturally and unconsciously adopt the "sunrise boundary". But how could the Chinese royal family adopt the midnight sun realm?

[A] The midnight sun realm actually originates from the concept of "yin and yang", the core component of ancient Chinese philosophical thought. First, ancient scholars noted the existence of "great cycles of four seasons of the year" and "small cycles of sunrise and sunset in one day". Secondly, the cycle of the four seasons of the year is also the annual movement of the sun. This circular motion causes a change in the intensity of sunlight. The ancients called the strong sunlight yangsheng yin decay, and the weak sunshine called yin sheng yang decay. Therefore, the temperature sensation brought by the ancients to human beings by the spring equinox and autumn equinox corresponds to the philosophical "balance of yin and yang", the temperature sensation brought by the summer solstice to human beings corresponds to the philosophical "yangsheng yin decay", and the temperature feeling brought by the winter solstice to human beings corresponds to the philosophical "yin sheng yang decay". The ancients also chose to take the winter solstice as the final starting point of the four seasons of the year. At this point, there is a dynamic of "slightly rising under the yin". The ancients also had elephant thinking (this is the pictographic analogy thinking that any nation has had. For example, folk still have the idea of "eating pig liver to supplement people's liver, eating pig lung to supplement human lungs", and the Inuit people in the Arctic region because of the snow in winter, there are very few animals, in order to catch animals in winter, they need a pair of particularly bright eyes, so they also treat animal eyes as a particularly precious delicacy after catching animals, for the main labor force in the family to enjoy, wives and children are not eligible to eat. This is the analogy of "eating eyes to make up for eyes". Under the guidance of analogy pictographic thinking, the sun's one-year cycle circle can be compared to the sun's one-day cycle circle. In this way, the winter solstice corresponds to midnight, the spring equinox corresponds to the morning, the summer solstice corresponds to noon, and the autumn equinox corresponds to dusk. Well, since the winter solstice corresponds to midnight, the identity of the starting point of the year of the winter solstice is also passed on to the midnight, so the midnight becomes the starting point of the day, and it becomes the dividing line between the two days before and after. Since the midnight night, as the sun realm, is the product of the philosophical thinking of the high-level intellectuals in ancient times, it naturally becomes the general representative of the ancient high-level intellectuals, the sun realm used by the emperor. Folk continue to use the more ancient sunrise boundary.

The above describes the reasons why the ancient royal family used the midnight sun realm.