Sumerian cosmology occupies a pivotal position in the depth-psychology corpus, functioning less as an object of purely historical inquiry than as the generative matrix from which the West’s mythological imagination derives its structural grammar. Campbell’s extensive engagement across the Masks of God series and The Mythic Image establishes Sumerian cosmology as the fountainhead of a mathematically ordered universe — one governed by immense cyclical numbers (432,000; 4,320,000), the precession of the equinoxes, and a graded hierarchy of divine manifestations symbolized architecturally in the ziggurat. Campbell insists that this tradition cannot be reduced to spontaneous psychic projection or Neolithic fertility concerns; it represents, rather, a documented achievement of astronomical observation and priestly calculation, deliberately encoded in myth. The Sumerian vision posits a cosmos of impersonal, ever-revolving time — cyclical, mathematical, transpersonal — which Campbell contrasts sharply with the Semitic and later Occidental turn toward a willful, personal deity and a linear history of exile and redemption. Within this framework, the separation of Heaven and Earth by Enlil, the descent of the me (divine ordinances), the figure of Enki as cosmic craftsman, and the moon’s role as temporal regulator all appear as key mythological nodes. Eliade and Seaford contribute supplementary perspectives on the cosmological order of Mesopotamian ritual and creation narrative respectively, while von Franz and Jaynes illuminate the psychological background of archaic cosmogonic thought.