The Laws of Constellations and Seasons / Astronomy
This term, which comes from The Book of Changes, refers to the laws governing the movements of constellations and the change of weather. The term tianwen (天文) means the constant laws that govern the movements of celestial bodies, the rotation of the four seasons, the succession of day and night, and the change of weather. The ancient Chinese believed that both human relationships and all things in the universe are governed by the same laws, and so by observing and following the laws of constellations and seasons, people can establish social order.
The Book of Changes describes the laws of heaven and earth. By looking at the stars above and the earth below, one can see what is implied and what is obvious. (The Book of Changes)
It is a law of heaven that the hard and soft interweave; it is a rule of humans that they should observe the rites and conduct restraint. By observing the movement of constellations, we can learn about the change of seasons; by observing development of human culture, we can enlighten the people and build a civilized society. (The Book of Changes)