The Mandate of Heaven (天命, tiānmìng): Ancient Chinese emperors were considered the “Sons of Heaven” (天子, tiānzǐ), and their right to rule was granted by a divine “Mandate of Heaven.” Astronomers served the imperial court, and celestial events like eclipses, comets, or supernovas were interpreted as omens reflecting Heaven's approval or disapproval of the emperor's reign. A well-predicted eclipse showed the emperor was in harmony with the cosmos; an unexpected one could signal dynastic trouble.
Harmony between Heaven and Earth (天人合一, tiān rén héyī): Unlike the Western post-Enlightenment separation of science and metaphysics, traditional Chinese thought emphasized a deep, interconnected relationship between the cosmos (天), humanity (人), and the Earth (地). Astronomy was the key to understanding and maintaining this cosmic harmony. The meticulous creation of the lunisolar calendar, essential for guiding agriculture, was a primary function of state-sponsored astronomy.
Comparison to Western Astronomy: While ancient Greek and Babylonian astronomy also had astrological elements, the direct link between astronomical phenomena and the political legitimacy of the ruler was uniquely strong and systemized in China. In the West, astronomy was primarily the domain of mathematics and physics (especially after Copernicus and Newton), while in China, it was inseparable from governance and philosophy for much of its history.