Uranus Opposition Calculator

Why the age is a range and not a number

Almost everything published about this contact puts it at 42, and 42 is simply half of 84.0. The arithmetic is right and the answer is not, because Uranus does not travel the zodiac at a constant rate. Its orbit is an ellipse, so it covers ground faster near perihelion than near aphelion, and the time to cross the half of the zodiac that starts at your natal degree depends on which half that is. Measured across the birth years in the table below, the opposition arrives anywhere from 39.7 to 44.1 — a spread of 4.4 years around a median of 43.1, and someone told "42" could be four years early or two years late.

That spread is not noise in the measurement. Two people born a decade apart genuinely have their oppositions at different ages, and the difference is large enough to matter to anyone trying to place the window in their own life. It is the same reason the Saturn return is not exactly 29 for everybody, one order of magnitude larger.

Three dates, and why this contact almost always has them

Uranus advances about 4.3° in an average year, and during its annual retrograde loop it retraces very nearly the same distance. Those two numbers being so close is the whole story: a degree Uranus passed in the months before it stationed is usually still inside the arc it is about to back over. So the opposition perfects three times for 91% of the birth years computed here — a direct crossing, a retrograde crossing, and a second direct one — typically spread across about a year.

Saturn behaves differently for the same structural reason. Its retrograde arc is a little over half its annual travel, so its loop catches a given degree far less often, and 33% of Saturn returns have three crossings against this page's 91%. The pattern is not a quirk of one planet: it is the ratio between how far a body backs up and how far it gets in a year, and it is computable for any of them.

An even count is impossible, and that is worth saying plainly because it is what makes the number trustworthy. To cross a degree a second time a planet has to have turned around, and having turned around it has to turn back before it can leave — so the crossings come in ones and threes. Where the searched range was too narrow to watch Uranus depart on both sides, the row below reports the crossings it found and says the total is unproven, rather than presenting a partial count as a complete one.

What the window is, as against the exact dates

The exact crossing is an instant, and three of them are three instants. What people usually mean by "my Uranus opposition" is the period around them, and that is what the in-orb column dates: the contiguous stretch in which transiting Uranus is within 3° of the opposite point, from the approach before the first crossing to the departure after the last. Measured across the rows below, a three-pass opposition holds that window for a median of 402 days and a one-pass opposition for 106 — the difference is the retrograde loop keeping the planet in the neighbourhood for most of a year.

3° is the envelope this whole site computes with, not a number chosen for this page: it is the same one behind the transit readings and the pressure model, so a window quoted here and a window quoted there mean the same thing. A tighter orb would give a shorter window and the same three crossing dates, because an exact crossing is exact at any orb.

What this page does not tell you

It dates the contact. It does not read it. The Life Cycles guide covers what the traditional reading of a Uranus opposition is, and Cosmic KPI itself measures the sky inside the window rather than describing it in advance — which contacts are exact when, how concentrated the rest of the chart is around them, and what was actually happening the last time the same geometry came round. A date is the beginning of that, not the end.