Macrocosm-Microcosm
Definition
Macrocosm-microcosm is a foundational idea in astrology: the human being — the microcosm, or "small order" — mirrors the larger universe — the macrocosm, or "great order" — in both structure and function. It pairs with the Hermetic axiom "as above, so below" and underlies medical astrology, temperament theory, and the principle of correspondence — the idea that planetary and zodiacal patterns can be read intelligibly in the body, the psyche, and the life of one person.
In Tradition
Across the Hermetic, Hellenistic-Neoplatonist, and medieval-Renaissance traditions, this doctrine is the philosophical justification for astrology itself: if the small order really does mirror the great order, then the planets at the moment of birth give a complete portrait of a person. The same idea runs through the Babylonian-mediated Hermetic synthesis, Stoic theory of cosmic sympathy, Plotinian Neoplatonist emanation, and medieval Latin natural philosophy.
In Practice
The doctrine is what lets an astrologer treat specific correspondences as valid and ground interpretive moves in something. In the melothesia scheme used by medical astrology, the zodiac maps onto the body from Aries at the head to Pisces at the feet. The nature of each planet is matched to organ function — Sun to heart, Moon to stomach and lymphatic system, Mercury to the nervous system — and to humoral quality. It also supports psychological astrology: just as the cosmos has an ordered hierarchy running from the Primum Mobile through the planetary spheres down to the sublunary world, the person is read as having matching levels of spirit, soul, and body, with the chart mapping the whole person rather than only outward circumstance.
Historical Origin
The doctrine is traced to the Hermetic Corpus and the Asclepius (Greco-Egyptian, 2nd–4th c. CE) and to Plato's Timaeus, carried forward through Plotinus and the medieval-Renaissance Latin tradition of Ficino, Pico della Mirandola, and Agrippa. Brian Copenhaver's Hermetica (Cambridge 1992) — a modern translation of public-domain Greek and Latin originals — is the standard English critical edition.
Etymology
Origin: Greek. Meaning: From makros (great) + kosmos (world, order) and mikros (small) + kosmos — "the great order and the small order".
Further Reading
- Brian P. Copenhaver, Hermetica: The Greek Corpus Hermeticum and the Latin Asclepius
- Nicholas Campion, A History of Western Astrology
- Charles Obert, Introduction to Traditional Natal Astrology