Synchronicity vs causality in astrology meaning

The question cuts to the metaphysical nerve of depth-psychological astrology, and Jung's answer is unambiguous — though he held it with characteristic tentativeness. The planets do not cause anything. They signify. The operative principle is not efficient causation but what Jung called synchronicity: the acausal correspondence of inner psychic states and outer events within a single qualitative moment.

Jung articulated this most directly in his memorial address for Richard Wilhelm, where he described the I Ching and astrology as expressions of the same underlying principle:

It seems as though time, far from being an abstraction, is a concrete continuum which possesses qualities or basic conditions capable of manifesting themselves simultaneously in different places by means of an acausal parallelism, such as we find, for instance, in the simultaneous occurrence of identical thoughts, symbols, or psychic states.

The formula that follows from this — "whatever is born or done at this particular moment of time has the quality of this moment of time" — is the shared foundation of both oracular systems. The horoscope does not record forces impressed upon the native; it reads the signature of the temporal moment in which that soul emerged. The precession of the equinoxes, which had long been wielded as a refutation of astrology, becomes irrelevant on this account: the zodiacal positions are not astronomical coordinates but markers of time-quality. As Jung wrote to Bernhard Baur in 1934, "time thus proves to be a stream of energy filled with qualities and not, as our philosophy would have it, an abstract concept" (Jung, 1975).

The causal model fails for reasons Plotinus had already identified in the third century. If the planets were genuine efficient causes, their effects would be uniform — identical star-groupings would produce identical results regardless of the native. They would have to be supposed capable of malice and benevolence, of being gladdened or distressed by their positions, of acting differently when in aspect than when not. Plotinus dismissed all of this as absurd, concluding that the stars function as signs — "letters on which the augur, acquainted with that alphabet, may look and read the future from their pattern" — without being causes of what they indicate (Plotinus, 270). The cosmos is one living whole whose parts correspond without causal exchange; the stars belong to that whole and participate in its meaning without transmitting anything.

Jung's own astrological experiment — the famous study of marriage horoscopes — was designed not to prove astrology but to demonstrate synchronicity in action. The statistically improbable clustering of classical marriage aspects (moon-sun, moon-moon, moon-ascendant conjunctions) across three separate batches of horoscopes was, in his reading, precisely a synchronistic phenomenon: a meaningful coincidence that "looks like a deliberate arrangement in favour of astrology" without constituting causal proof of anything. He wrote to Michael Fordham that "synchronicity represents a direct act of creation which manifests itself as chance" — the exception, not the statistical average, is where reality actually lives (Jung, 1976).

Von Franz extended this into its ontological ground. Synchronistic events point toward the unus mundus, the unitary psychophysical substrate that Gerhard Dorn had named as the third stage of the alchemical coniunctio. The horoscope's circular structure was identified in early alchemy with the prima materia itself — a mandala-like image of the whole that serves as a "cybernetic device" for contacting what Jung called "absolute knowledge," the a priori knowing that synchronistic events disclose (von Franz, 2014). The astrological chart, on this reading, is not a causal mechanism but a mandala: a symbolic image of the moment's wholeness, legible to those who know the alphabet.

Tarnas carries the lineage forward by integrating the Platonic and Jungian conceptions of archetype. Where Jung's archetypes were primarily formal principles of the human psyche, Plato's were principles of reality itself. Archetypal astrology suggests both are true simultaneously: the planetary archetypes are "both 'Jungian' (psychological) and 'Platonic' (metaphysical) in nature," informing outer cosmos and inner psyche alike — "as above, so below" not as causal transmission but as participation in a common ordering principle (Tarnas, 2006). The collective unconscious, on this account, is ultimately embedded in the macrocosm itself, and the planetary motions are a synchronistic reflection of its unfolding archetypal dynamics.

What this means practically is that the astrologer is not a physicist tracking forces but a reader of signs — closer to the augur Plotinus described than to the mechanistic model that popular astrology often implies. The chart speaks because the moment speaks; the planets are its most legible alphabet.

  • synchronicity — the acausal connecting principle and its ontological ground in the unus mundus
  • unus mundus — the unitary psychophysical substrate underlying synchronistic correspondence
  • Liz Greene — depth-psychological astrologer who grounds the synchronicity-fate connection in clinical practice
  • Richard Tarnas — philosopher and astrologer who integrates Platonic and Jungian archetypal theory

Sources Cited

  • Jung, C.G., 1966, The Spirit in Man, Art, and Literature
  • Jung, C.G., 1975, Letters Volume 2, 1951–1961
  • Jung, C.G., 1976, Collected Works Volume 18: The Symbolic Life
  • Jung, C.G., 1960, The Structure and Dynamics of the Psyche
  • Von Franz, Marie-Louise, 2014, Psyche and Matter
  • Von Franz, Marie-Louise, 1975, C.G. Jung: His Myth in Our Time
  • Plotinus, 270, The Six Enneads
  • Tarnas, Richard, 2006, Cosmos and Psyche