The concept of Cosmic Cycle occupies a foundational position across the depth-psychology corpus, appearing wherever mythological, astrological, and metaphysical traditions intersect with questions of time, renewal, and the structure of existence. Eliade establishes the interpretive ground: sacred calendars and festival repetitions enact an ‘eternal return’ of primordial divine gestures, rendering cosmic cyclicity the very medium of religious experience. Campbell extends this into a comparative cosmological argument, tracing the number 432,000 — the common denominator of Indian yugas, Babylonian king-lists, and Norse Götterdämmerung cycles — as evidence of a shared, mathematically grounded conception of cosmic eons that underwrites all high-civilization mythology. Von Franz situates the cyclical apprehension of time as an archetypal structure rooted in astronomical observation and personified in Saturn-Kronos as ‘giver of measures.’ Rudhyar, from within transpersonal astrology, systematizes the Cosmic Cycle into a hierarchy of nested rhythms — axial, orbital, precessional — each corresponding to distinct levels of individual, collective, and planetary selfhood. The Stoics, as reported in Long and Sedley, conceived the cycle as cosmogonic fire itself, identifying the divine with a designing intelligence that periodically creates and absorbs the world. Heinrich Zimmer’s index entries signal the degree to which the universal cycle — cosmogony, dissolution, and re-emergence — structures all of Indian mythological symbolism. The principal tension throughout the corpus is between cyclical timelessness, in which history is merely repetition, and the linearity demanded by faith and individuation.