Saturn goes retrograde once a year, and never skips one. That changes the question: instead of "when is the next one", what usually matters more is "is it retrograde now?", and on more than a third of the days in the year the answer is yes. The times below are Brasília time and come from the same ephemeris this site uses to cast charts.

In Aries, from July 26, 2026 to December 10, 2026, with the shadow from April 20, 2026 to March 15, 2027; in Aries, from August 9, 2027 to December 23, 2027, with the shadow from May 4, 2027 to March 27, 2028; in Taurus, from August 22, 2028 to January 5, 2029, with the shadow from May 18, 2028 to April 9, 2029; in Taurus, from September 6, 2029 to January 19, 2030, with the shadow from June 1, 2029 to April 23, 2030; in Gemini, from September 20, 2030 to February 1, 2031, with the shadow from June 16, 2030 to May 7, 2031; in Gemini, from October 5, 2031 to February 16, 2032, with the shadow from July 1, 2031 to May 20, 2032; in Cancer, from October 18, 2032 to March 1, 2033, with the shadow from July 15, 2032 to June 4, 2033; and in Cancer, from November 2, 2033 to March 15, 2034, with the shadow from July 30, 2033 to June 19, 2034.

Look at the start dates. The start date slides about two weeks forward each year: July 26, August 9, August 22, September 6. It is not irregularity, it is the difference between the Earth’s year and its next meeting with Saturn, and the next section explains where it comes from.

Retrogradation is not the planet moving backwards: it is the Earth overtaking it on the inside, with the apparent motion reversing while that lasts. What decides the frequency, then, is how long the Earth takes to gain one full lap on the other planet.

Saturn takes twenty-nine and a half years to go once around the zodiac. It is so slow that the Earth overtakes it almost every time it completes a lap of its own: the meeting repeats every 378 days, thirteen more than a calendar year. That is why the retrogradation happens once a year, and why the date slides by two weeks.

It is the exact opposite of Mars, which is covered in Mars retrograde: Mars is fast enough that the Earth takes 25 months to overtake it, and that is why 38 of the 96 years between 1930 and 2025 had not a single day of Mars retrograde. With Saturn there was no such year, there were 93 periods in 96 years, without a gap.

The length barely changes. Measured over the same 93 periods: the shortest lasted 133.6 days and the longest, 141.4. The average is 137.9, four and a half months.

That is 7.8 days of spread on a length of 138, and that steadiness is what separates Saturn from the inner planets. Mars varies from 60 to 81 days, a third more over a length less than half of this one. The cause is the same in both cases, and it is distance: the size of the loop depends on how close the two bodies pass, and the further out the planet, the less the distance between them changes from one meeting to the next.

The stretch retraced backwards keeps the same calm: between 6.6 and 7.0 degrees across all 93 periods. Mars retraces from 10 to 19.5 degrees, depending on the sign.

That logic has a predictable end, and the whole series is worth seeing at once. I measured the eight planets with the same ephemeris, over the same 96 years:

Venus is retrograde 7.2% of the time, and each period lasts about 42 days; Mars, 9.5%, 60 to 81 days; Mercury, 19%, about 21 days; Jupiter, 29.9%, 117 to 124 days; Saturn, 36.6%, 134 to 141 days; Uranus, 40.7%, 149 to 154 days; Pluto, 43.1%, 156 to 162 days; and Neptune, 43.2%, 157 to 160 days.

The share of time rises from first to last, and it has a ceiling: 50%. A planet standing still in the sky would be retrograde exactly half the time, because the Earth would spend half of its lap approaching and half moving away. Neptune and Pluto, which barely move in ninety years, reach 43%, close to the ceiling, and never at it.

That changes what the word "retrograde" can explain. Something that happens on 43% of days does not tell one day from another. Reading the slow planets is about the HOUSE and the sign they are in, and the subject is covered in what a retrograde planet is.

The shadow is the stretch of sky the planet covers moving forward before retracing it backwards. It opens on the day it crosses the degree where it will stop going back, and closes on the day it regains the degree where the retrogradation began.

In Saturn it runs from April to March of the following year: 329 days around a core of 137. Compare that with Mercury, where the shadow opens two weeks before and closes two after. The shell is almost three times the core, as in Mars, except that here it fills almost the whole year, and the next one starts before the previous has closed.

In practice this means the subject does not arrive on the published date. It shows up on the way out, as a commitment being set up; it comes back in the middle, to be checked; and it resolves on the way out of it, months later. Anyone looking only at the two middle dates thinks the period came out of nowhere.

In tradition, Saturn governs the limit, the structure, the deadline and authority, what demands and what is demanded. What retrogradation does to each of them is the same thing, and it is recognisable:

• The demand comes from inside. The measure that usually comes from outside, a boss, a contract, a deadline, someone’s expectation, starts coming from you. It is the phase in which a person holds herself to something nobody asked for.
• The commitment already made asks to be checked. What was agreed out of habit rather than choice suddenly becomes uncomfortable. A contract, a partnership, a role, an old promise: nothing breaks on its own, but the question shows up.
• Outside authority loses its grip. Anyone who decides something only because they were told to tends to stall. And anyone already deciding on their own feels nothing, which is part of why so many people never notice the phase.
• The deadline turns out to have been optimistic. The sums that seemed to fit stop fitting, and the fix is to redo the sums, not to run faster.

And the limit said out loud holds: astrology does not predict redundancy, diagnoses nobody and decides for nobody. These are tendencies, and a tendency is something you work with.

There is no prohibition, and the arithmetic shows why: if you are 40, you have already lived through about fifteen years of Saturn retrograde. Some of the best agreements of your life were signed inside them.

What pays off: reviewing what is already standing. Renegotiating a deadline, rereading a contract, redoing a budget, asking for the raise that was left for later, closing what has already ended in practice. The phase favours whoever checks the agreement.

What yields less: taking on a new commitment to prove something to someone. Not because it will go wrong, because the reason is usually outside pressure, and that is exactly what this phase calls into question.

What is not worth postponing: a legal deadline, an enrolment, a treatment, surgery scheduled by the doctor, a signature with a date on it. None of those gets better for waiting four and a half months, and in Saturn the next clear window is always short: seven and a half months of direct motion are left, and the shadow eats a good part of them.

Being born in a Saturn retrograde period is not living a transit: it is a fixed trait. And it happens to 36.6% of people, more than one in three.

It is the most common of the natal retrogradations, and that changes how much it weighs. Natal Mercury retrograde happens to about 19%; Mars, to 9.5%; Venus, to 7.2%. A feature more than a third of people have distinguishes almost nothing on its own, it gets interesting once you look at WHERE Saturn is.

Someone with Saturn retrograde in the chart usually has a relationship of their own with authority: the inner measure is harder than the outer one, recognition from outside takes a while to convince, and the person holds herself to a standard nobody agreed with her. It is not a lack of Saturn, it is Saturn turned inward.

The house it fell in says in which area this happens, and that depends on the hour and city of birth. The text describing the natal retrogradation of every planet, with the proportions of each, is what a retrograde planet is. And if you want to read your Saturn by sign and by house, the series begins at Saturn in Aries.

And the questions that come up most on this subject, with the short answer: