What's actually happening
Neptune takes about 165 years to complete one circuit of the zodiac, spending roughly 14 years in each sign. Scorpio is a fixed water sign, traditionally co-ruled by Mars and Pluto. The Neptune in Scorpio transit that ran from roughly 1956 to 1970 is the astrological background of the psychedelic and countercultural movements, the sexual revolution, and the beginning of the modern psychological age.
What the tradition makes of it
Neptune in Scorpio places the spiritual longing in the depths. The transcendence sought is not upward but downward — into the unconscious, into intensity of experience, into the revelation of what ordinary consciousness conceals. The mystical experience is accessed through depth rather than through elevation.
The tradition associates this transit with the dissolution of sexual and psychological taboo, with the widespread cultural interest in altered states of consciousness, and with the emergence of depth psychology as a mainstream language for the spiritual life.
The shadow is the confusion of intensity with significance — the experience that overwhelms as a substitute for the experience that transforms.
How to actually use it
Seek depth deliberately, with structure. The spiritual access of Neptune in Scorpio is genuine; it requires a container, a practice, a return path. The dissolution it offers can be genuinely liberating or genuinely disorienting depending on the degree of intention brought to it.
When in doubt
Is the intensity revealing something — or only producing itself?