How Long Does Each Planet Stay in a Sign?

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"How long is Saturn in a sign?" sounds like a question with one answer. It has two. A planet that turns retrograde near a sign boundary can enter a sign, slip back into the previous one for a few months and then enter again. Measured from the first entry to the final exit, that visit is long. Counted as the time the planet was actually inside the sign, it is shorter. This page measures both for eleven bodies with one fixed rule, and leads with the second, because that is what "staying in a sign" means.

What the measurement found:

• The Moon and Sun are regular. In a ten-year sample the Moon spent 47 to 61 hours in each sign. The Sun spent 29.4 to 31.5 days, longest in the signs it crosses around the northern summer.
• Mercury, Venus and Mars have two kinds of stay. An ordinary Mercury stay was 14 to 21 days, an ordinary Venus stay 24 to 32 days and an ordinary Mars stay 38 to 57 days. When a whole retrograde loop fell inside one sign, the stay jumped to about 66 to 69 days (Mercury), 120 to 126 days (Venus) or 182 to 235 days (Mars).
• From Jupiter outward, re-entries are normal. About a third of Jupiter's sign visits, four in five of Saturn's and every visit of Uranus, Neptune and Pluto in this window included at least one re-entry. For those planets the first-entry-to-final-exit span runs months longer than the time actually spent in the sign.
• Pluto is the uneven one. Its time inside a sign ranged from about 11 and a half years (Scorpio, 1983 to 1995) to almost 29 years (Aries, a projection for 2066 to 2097).
• The Mean Node never varies. The Node the chart uses moves backward at a steady rate and spent the same 18.6 months in every sign.

Educational guide: Astrologist.com does not offer an ingress calendar or a sign-change calculator, and the free birth chart shows the positions at your birth only. Every number on this page comes from a one-off offline calculation made for this article with the planetary routines behind the free chart. Dates after October 2026 are model projections. The page measures time and geometry; it says nothing about a sign being stronger or weaker while a planet is in it.

What this page adds

Many pages on this site give a round figure in passing: Jupiter about a year per sign, Saturn about two and a half years, Uranus about seven, Neptune about fourteen, Pluto anywhere from twelve to more than thirty. Those figures are useful shorthand. This page is the measured version, with the same rule for every body, and with the difference between a span and an occupancy kept visible.

It is not a sign-change calendar, and it is not the guide to being born in a changeover year; that is slow-planet sign changes and your birth year. Chiron is measured on its own page, why Chiron changes signs unevenly, and is not repeated here.

How it was measured

The rules were agreed in a scope review before any number was computed.

• Bodies and source. Sun and Moon as in the free chart's own routines; Mercury to Neptune from its planetary routine (VSOP87B via the astronomia library, apparent Tropical longitude of date); Pluto from its own routine (Meeus chapter 37); the Mean Node from the chart's mean-node formula. Time handling as in the chart.
• Window. 1 January 1900 00:00 UT up to, but not including, 1 January 2100, for every body except the Moon. The Pluto routine is limited to 1885 to 2099, and every Pluto position used lies inside that range. The Moon was measured over a ten-year sample, 1 January 2000 up to 1 January 2010, sampled hourly; it is a sample, not a two-hundred-year sweep.
• One continuous track. Each body was sampled every 6 hours (the Moon every hour) and joined into one continuous longitude, so passing 0° Aries needs no special handling. Retrograde and direct turns were located and inserted into the track, so that a quick exit and return near a turn could not hide between two samples. None did.
• Sign boundaries. A crossing is a pass over a Tropical 30° boundary, refined to under a minute within the model.
• One visit. A visit to a sign starts at the first entry and ends at the final exit, after any retrograde re-entries that belong to that pass. The next time the planet comes round the zodiac to the same sign is a new visit. The Mean Node moves backward, so it enters each sign at the end of the sign and leaves at the beginning; the same rule applies.
• Complete visits only. A visit counts as complete when its first entry and its final exit both fall inside the window. The Sun, Moon and Mean Node never reverse direction in the chart's routines, so for them the ordinary boundary crossings alone close the visit. For Mercury to Pluto, which do turn retrograde, the surrounding turns inside the window are also used: a retrograde turn before the first entry, short of the sign, and a direct turn after the final exit, past the sign, together show that no earlier or later re-entry can belong to the same visit. Visits cut off by either end of the window, or not closed in this way, were counted separately as open and left out of the figures below.
• Three numbers per visit. Occupancy: the total time actually inside the sign. Span: first entry to final exit, including any months spent back in the neighbouring sign. Entries: how many times the planet entered the sign during the visit. Medians are given with the 10th to 90th percentile range; the shortest and longest are marked as extremes.

The measured stays

Time actually inside the sign comes first in every row. For the Sun, Moon and Mean Node the occupancy and the span were identical, as they should be for bodies that never turn back; that served as a check on the method.

Open visits, left out of the table: Mercury 5 at the start of the window and 4 at the end, Venus 6 and 17, Mars 9 and 2, Saturn 2 and 1, Jupiter 1 and 2, and one at each end for the other bodies. Venus has the most at the end because its last direct turn inside the window came in 2098, so a visit after that has no later turn inside the window to show it was over.

Round figures elsewhere on the site sit close to these numbers. Where they are compared, keep the two measures apart: in this window, Neptune's complete visits spanned 14.0 to 14.9 years from first entry to final exit, while its time actually inside each sign was 13.3 to 13.9 years. Pluto's spans ran from 12.0 to 30.7 years and its occupancies from 11.5 to 28.7 years.

Mercury, Venus and Mars: ordinary stays and retrograde stays

For the three inner moving planets a single median hides two very different situations, so they are split three ways.

Each cell gives the median, the 10th to 90th percentile range in brackets and then the extremes.

Three things stand out.

• A long stay inside one sign is real, but rare. The longest stays in the window were genuine, uninterrupted residence: Mercury 69 days in Cancer in June to August 1934, Venus 126 days in Cancer in May to September 1908, Mars 235 days in Virgo from November 2090 to June 2091 (a projection). Each time, the whole retrograde loop fell inside one sign. That happened in 14.5% of Mercury's visits, 2.3% of Venus's and 3.4% of Mars's.
• A re-entry visit looks longer than it is. When the loop straddles a boundary, the planet enters, falls back into the previous sign and enters again. The span of such a visit is close to a full loop, but the planet is in the sign for much less of it. A Mars re-entry visit spanned a median 216 days, yet Mars was in the sign for a median 137 of them. That is why this page never says Mars "stayed" 216 days in a sign.
• Venus re-enters least often. Venus turns retrograde about once every 19 months and its loop is short compared with its speed, so only 5.7% of its visits included a re-entry. Mercury turns back three times a year, so almost one visit in four did.

How often each planet is retrograde at all is a separate measurement, on how common are retrograde planets.

Jupiter to Neptune: re-entries become the rule

From Jupiter outward, every planet turns retrograde about once a year and spends months, then years, in each sign, so a boundary is quite likely to fall inside a backward loop.

• Jupiter. 131 of 200 visits had a single entry, 38 had two and 31 had three. Median occupancy was 12.5 months. The shortest, a projected visit to Aries from June 2093 with one re-entry, left only 7.4 months actually inside the sign over a span of 11.9 months; the longest spans, with re-entries at both boundaries, reached 21 months.
• Saturn. Only 14 of 80 visits had a single entry. Saturn's orbit is noticeably eccentric too: its shortest occupancies here (about 25 months) were in Gemini and Cancer, its longest (about 36 months) in Sagittarius and Capricorn.
• Uranus. Every visit had two or three entries. Occupancy ran from 6 years 4 months to 7 years 9 months, shortest around Leo to Libra and longest around Pisces and Aries.
• Neptune. Every visit had three or four entries. Neptune's orbit is close to circular, so its occupancies were the most even of the slow planets: 13 years 3 months to 13 years 11 months.

Pluto, sign by sign

Pluto's orbit is far from circular. It moves fastest when it is closest to the Sun (which last happened in 1989, while it crossed Scorpio) and slowest at the far end of its orbit. That is the whole reason its stays differ so much.

Pluto was already in Gemini when the window opened and entered Taurus near its end, so those two visits are open and not listed. Dates after October 2026 are projections. Because Pluto moves so slowly near a boundary, sources can place the same crossing several hours apart, which occasionally moves it across midnight; the months above are not affected.

The Sun, the Moon and the Mean Node

• Sun. 29.4 to 31.5 days in every sign. The Earth is farthest from the Sun in early July, so the Sun appears to move slowest in the signs around then: the longest stays were in Gemini and Cancer and the shortest in Capricorn and Sagittarius.
• Moon. 47 to 61 hours per sign in the ten-year sample. The Moon's own orbit is eccentric and its speed changes through the month, so a Moon sign can last anything from just under two days to about two and a half.
• Mean Node. The Node the chart calculates is the Mean Node, which moves backward at an almost constant rate: every complete visit lasted 18.6 months, to within a few minutes. The True Node wobbles around it and has its own, uneven sign dates; see Mean Node vs True Node. Nothing on this page uses the True Node.

Why the numbers matter for reading a chart

Two practical points follow, and neither of them is about a planet being stronger or weaker in a sign.

• Shared signs. The longer a planet stays in a sign, the more people share that placement. Births within the same 13 to 14 years mostly share a Neptune sign; people born a few weeks apart can have different Mars signs. How to read the slow, shared placements is on outer-planet signs and generations.
• Year tables can mislead. During a re-entry visit the planet sits in the previous sign for part of the span. A birth in those months belongs to the previous sign, even though a table of ingress years may suggest otherwise. That is the subject of slow-planet sign changes and your birth year; the chart's own degrees always settle it.

Stays in houses are a different question again, because house sizes depend on the birth place and time; for a moving planet passing through natal houses, see the tours such as Saturn transits through the houses.

Precision, kept in separate boxes

• Solver tolerance. Crossings were refined to under a minute within each model and turns to about a minute. That describes the arithmetic, not the sky.
• The models. VSOP87B for Mercury to Neptune, Meeus chapter 37 for Pluto (limited to 1885 to 2099), the chart's own Sun, Moon and Mean Node routines. The Moon figures come from a ten-year sample only.
• Repository checks. The project tests these routines against the Swiss Ephemeris at daily noon from late 1919 to early 2061 with a 0.05° position allowance and separate station-timing gates. Those are allowances for the whole range, not error bars on these stays.
• What the Swiss Ephemeris showed here. Used only as a check, never as a source: for all 45 Pluto and 49 Neptune boundary crossings in the window, Swiss timed the crossing a median 6 minutes (Pluto) and 9 minutes (Neptune) from the chart's routine, at most about 3 hours (Pluto, at a slow crossing in 2066) and 39 minutes (Neptune). Five of those 94 crossings fell on a different UT date in Swiss because they lie close to midnight. For the first ten backward crossings of a boundary by Mercury, Venus and Mars from 1900, the two agreed to within a minute.

Checking a stay yourself

1. Look up the planet in a Tropical ephemeris and note the dates it enters and leaves the sign, including any retrograde re-entries.
2. Add up only the stretches when it was inside the sign: that is the occupancy. First entry to final exit is the span.
3. For your own chart, the sign of each planet at birth is on the free birth chart; if you were born near a boundary, the degrees decide, not a year table.

For a different kind of count, how many slow-planet contacts to a birth chart are active together on a given day, see how many transits are active at once. Ask the Astrologist can talk through your chart and dates you bring from an ephemeris; it does not calculate ingress dates.

Related articles

• How Many Transits Are Active at Once?
• Slow-Planet Sign Changes and Your Birth Year
• Why Chiron Changes Signs Unevenly
• Outer-Planet Signs and Generations
• How Common Are Retrograde Planets?
• Mean Node vs True Node