王充
In his "Balanced Discourse" ("Lunheng"), Wang Chong (27–100 CE) wrote that some Han thinkers believed that rain fell from the Heavens (i.e. where the stars were located). Wang argued that, although rain fell from above, this common theory was false. He agreed with another theory that stated clouds were formed by the evaporation of water on earth, and that since clouds disperse rain, clouds and rain are in fact one and the same; in essence, he accurately described the water cycle.