Chronicles of the official cults of Song and Ming China record detailed court debates on proper sacrifice to the gods of the imperial pantheon. Court officers limited valid precedents of official cults to approved editions of the Classics and commentaries. I argue that these debates conceptualize the built environments of altars and temples used to feast the gods as literal microcosms of particular spheres of the cosmos. Suburban Sacrifice feasted the deity called Vast Heaven High God 昊天上帝 at Round Terrace 圜丘, which reproduced Vast Heaven 昊天 as vaulted firmament 穹蒼 that was populated by a host of lesser deities and traversed by High God 上帝. School Libations 釋奠 feasted Confucius as Sage at Culture Temple 文廟, which reproduced lineages of Confucius’s followers who transmitted his teachings, the Classics, or the Dao itself. I construe these ritual spaces not as metaphors for or symbols of some other (absent) objective, but as perfect indexical reproductions of the Celestial and Cultural spheres respectively within the controlled environs of ritual space. I argue that cult ritual is a distinctive mode of human intervention into the cosmological forces that surge through and between ritual space and the universe. I read court debates on official cults as maps of the cosmos itself in order to describe the parameters of how Confucian officers understood the esoteric operations of the cosmos and how particular kinds of intentional human actions affect those operations through ritual interventions in the built environs of altars and temples.