Why Did the Chinese Devote a Great Deal of Attention

Why did the Chinese devote a great deal of attention to astronomy and calendrical science?

A) They wanted to decipher the mysteries of the universe and gain greater control over nature.
B) They believed that the stability of the kingdom depended on the emperor's ability to calculate correct dates for festivals, court sessions, mourning periods, and agricultural work.
C) They needed a clear understanding of the constellations and other celestial features in order to navigate the world's oceans.
D) They believed that astronomy was the key to a universal and objective understanding of the natural world.