What's happening
Pluto's orbit is long and eccentric. A full circuit of the zodiac takes about 248 years, and the time it spends in any one sign varies from roughly twelve to thirty years depending on where it is on that ellipse. The ingress into Aquarius is the moment Pluto's ecliptic longitude crosses from 29° Capricorn into 0° Aquarius.
Because Pluto's retrograde motion cycles it back and forth across the sign boundary several times before it finally commits, the "ingress" is usually a sequence of crossings over two to three years rather than a single date. Astrologically, the last crossing — when Pluto enters the new sign for good — is the one most commonly treated as the real beginning.
The tradition
Pluto is the slowest weather in the chart. Tradition associates the planet with depth, transformation, power, compulsion, and what moves underground until pressure forces it to surface. Because it moves so slowly, Pluto is rarely personal in the way Venus or Mars can be. It describes the tectonic layer a generation grows up on.
Aquarius is a fixed air sign, classically ruled by Saturn and, in modern astrology, co-ruled by Uranus. Its themes are the collective, the network, the abstract system, the peer group, the reformer's impulse, and the logic that cuts across loyalty and tribe. Pluto here spends a generation working on how power concentrates and redistributes within networks and institutions — technology, data, movements, the crowd.
The previous Pluto in Aquarius transit ran from the mid-1770s through the late 1790s — the era of the American and French revolutions and the earliest industrial machines. The themes are not prescriptions, but the rhyme is worth noticing.
How to work with it
Do not try to personalize a generational transit like a fast one. The work of Pluto in Aquarius is structural: what you are part of, what the network you participate in is doing, where your work touches the collective. Pay attention to the institutions that are quietly losing legitimacy and the ones that are quietly gaining it. Notice where a tool you rely on has started to shape the community around it more than the community shapes the tool.
The shadow is techno-utopianism in either direction — believing the network will save us, or believing it will doom us. Aquarius at its best is neither; it is the patient work of designing better collective systems while holding honest eyes on what power is doing inside them.
The simple rule
Ask what is shifting at the level of everyone, not just at the level of you. Pluto in Aquarius is the long answer, and the question it is answering will take decades to fully phrase.