Jupiter is the largest planet. It needs close to twelve years to go once around the zodiac. So people say it spends about a year in each sign. That is true on average, but not sign by sign. I measured it over 67 full laps of Jupiter, 1607 to 2402. Aries gets the smallest share of all twelve signs. Jupiter sits in Aries 7.57 percent of the time. A fair share would be 8.33 percent, one part in twelve. Libra, at the top, gets 9.14 percent.
Put in days, Jupiter spends about 328 days in Aries per lap of the zodiac, and about 396 days in Libra. That gap is more than two months. The cause is the shape of the orbit, and I show it below. This page also gives the exact dates of each stay from 1927 to 2047, in UTC and in New York time. If you want to know whether you were born with Jupiter in Aries, the dates are the answer.
Were you born with Jupiter in Aries? Every stay from 1927 to 2047
Jupiter goes back to Aries about every 11.9 years. Some visits are one clean run. Others are cut in two by a backward loop. Astrologers call that loop retrograde motion. The planet seems to drift back against the stars for about four months. Nothing turns around in space. Earth simply passes Jupiter on the inside lane, the way a slow car seems to slide back as you pass it.
Here is every stay in Aries from 1927 to 2047. Times come from NASA’s JPL Horizons service and are rounded to the minute. The first time is in UTC, the world clock. The second is New York time, with daylight saving time where it applied.
| Stay | Jupiter enters Aries | Jupiter leaves Aries | Where it goes next. |
| 1927 to 1928, part one | 6 June 1927, 10:13 UTC (6:13 a.m. in New York) | 11 September 1927, 03:43 UTC (11:43 p.m. on 10 September in New York) | Back into Pisces. |
| 1927 to 1928, part two | 23 January 1928, 02:53 UTC (9:53 p.m. on 22 January in New York) | 4 June 1928, 04:50 UTC (12:50 a.m. in New York) | On into Taurus. |
| 1939 to 1940, part one | 11 May 1939, 14:07 UTC (10:07 a.m. in New York) | 30 October 1939, 00:45 UTC (7:45 p.m. on 29 October in New York) | Back into Pisces. |
| 1939 to 1940, part two | 20 December 1939, 17:02 UTC (12:02 p.m. in New York) | 16 May 1940, 07:54 UTC (3:54 a.m. in New York) | On into Taurus. |
| 1951 to 1952 | 21 April 1951, 14:56 UTC (9:56 a.m. in New York) | 28 April 1952, 20:49 UTC (4:49 p.m. in New York) | Into Taurus in one clean run. |
| 1963 to 1964 | 4 April 1963, 03:19 UTC (10:19 p.m. on 3 April in New York) | 12 April 1964, 06:52 UTC (1:52 a.m. in New York) | Into Taurus in one clean run. |
| 1975 to 1976 | 18 March 1975, 16:47 UTC (12:47 p.m. in New York) | 26 March 1976, 10:24 UTC (5:24 a.m. in New York) | Into Taurus in one clean run. |
| 1987 to 1988 | 2 March 1987, 18:41 UTC (1:41 p.m. in New York) | 8 March 1988, 15:44 UTC (10:44 a.m. in New York) | Into Taurus in one clean run. |
| 1999 to 2000, part one | 13 February 1999, 01:22 UTC (8:22 p.m. on 12 February in New York) | 28 June 1999, 09:29 UTC (5:29 a.m. in New York) | Ahead into Taurus. |
| 1999 to 2000, part two | 23 October 1999, 05:48 UTC (1:48 a.m. in New York) | 14 February 2000, 21:39 UTC (4:39 p.m. in New York) | Into Taurus for good. |
| 2010 to 2011, part one | 6 June 2010, 06:27 UTC (2:27 a.m. in New York) | 9 September 2010, 04:49 UTC (12:49 a.m. in New York) | Back into Pisces. |
| 2010 to 2011, part two | 22 January 2011, 17:11 UTC (12:11 p.m. in New York) | 4 June 2011, 13:56 UTC (9:56 a.m. in New York) | On into Taurus. |
| 2022 to 2023, part one | 10 May 2022, 23:22 UTC (7:22 p.m. in New York) | 28 October 2022, 05:09 UTC (1:09 a.m. in New York) | Back into Pisces. |
| 2022 to 2023, part two | 20 December 2022, 14:32 UTC (9:32 a.m. in New York) | 16 May 2023, 17:20 UTC (1:20 p.m. in New York) | On into Taurus. |
| 2034 to 2035 | 21 April 2034, 09:39 UTC (5:39 a.m. in New York) | 29 April 2035, 18:57 UTC (2:57 p.m. in New York) | Into Taurus in one clean run. |
| 2046 to 2047 | 4 April 2046, 16:10 UTC (12:10 p.m. in New York) | 13 April 2047, 21:03 UTC (5:03 p.m. in New York) | Into Taurus in one clean run. |
Read the table like a map of birth dates. If you were born inside one of those windows, your natal Jupiter is in Aries. If you were born in a gap, it is not. A birth on the very day of a crossing needs the hour and the place. A New York baby born at 8 p.m. on 29 October 1939 came after the exit, so that child has Jupiter in Pisces.
The gaps count as much as the stays. Take autumn 2010. Jupiter left Aries on 9 September and came back on 22 January. A child born in November 2010 has Jupiter at the very end of Pisces, not in Aries. The page on Jupiter in Pisces covers that case.
The 2022 to 2023 stay, cut in two
The last visit is the one most readers ask about, since it covers babies born from 2022 to 2023. It came in two pieces, and the first piece ended in the middle of the night on the East Coast.
| Event | UTC | New York time. |
| Jupiter enters Aries | 10 May 2022, 23:22 | 10 May 2022, 7:22 p.m. |
| Jupiter stops and turns back, at 8°43′ Aries | 28 July 2022, 20:34 | 28 July 2022, 4:34 p.m. |
| Jupiter slips back into Pisces | 28 October 2022, 05:09 | 28 October 2022, 1:09 a.m. |
| Jupiter stops and moves forward, at 28°48′ Pisces | 23 November 2022, 23:01 | 23 November 2022, 6:01 p.m. |
| Jupiter enters Aries again | 20 December 2022, 14:32 | 20 December 2022, 9:32 a.m. |
| Jupiter leaves for Taurus | 16 May 2023, 17:20 | 16 May 2023, 1:20 p.m. |
So there are two windows. The first runs from the evening of 10 May 2022 to the night of 27 to 28 October 2022, New York time. The second runs from the morning of 20 December 2022 to the early afternoon of 16 May 2023. A baby born on 27 October 2022 at 11 p.m. in New York has Jupiter in Aries. A baby born two hours later does not. Jupiter spent 170 days in Aries in the first piece and 147 days in the second. That is 317 days in all, below the usual count for a clean run.
One more fact makes this stay stand out. Jupiter passed its perihelion on 21 January 2023. Perihelion is the point of an orbit closest to the Sun. So children born in the second window have Jupiter in Aries in the weeks when the planet ran at its top speed.
Why Aries is Jupiter’s shortest sign
Jupiter’s orbit is not a perfect circle. It is a slightly stretched loop. On one side, Jupiter comes about 4.95 times as far from the Sun as Earth is. On the other side, it goes out to about 5.46 times that distance. Johannes Kepler found the rule in 1609: a planet moves faster when it is near the Sun. So Jupiter crosses the part of the sky near its perihelion quickly, and the far part slowly.
I checked where the perihelion falls. All 67 perihelia from 1600 to 2400 land in Aries, between 7 and 20 degrees of the sign, as seen from the Sun. The point creeps forward slowly, by about 13 degrees in 800 years. The far point, called aphelion, sits right across the circle, in Libra. That is why Libra holds Jupiter longest and Aries holds it least. The main page on Jupiter in astrology gives the same count for all twelve signs. Here it is again, with each sign’s share of time.
| Sign | Days Jupiter spends there per lap | Share of all time, 1607 to 2402. |
| Aries | 328 days | 7.57 percent, the lowest. |
| Taurus | 333 days | 7.68 percent. |
| Pisces | 334 days | 7.71 percent. |
| Aquarius | 341 days | 7.88 percent. |
| Gemini | 344 days | 7.94 percent. |
| Capricorn | 354 days | 8.16 percent. |
| Cancer | 367 days | 8.48 percent. |
| Leo | 372 days | 8.58 percent. |
| Sagittarius | 380 days | 8.76 percent. |
| Scorpio | 391 days | 9.03 percent. |
| Virgo | 393 days | 9.06 percent. |
| Libra | 396 days | 9.14 percent, the highest. |
Note the two neighbors. Pisces and Taurus sit on each side of Aries, and they come second and third from the bottom. The fast stretch of the orbit covers all three. In plain terms, out of every 1,000 people, about 76 have Jupiter in Aries and about 91 have it in Libra. Those counts assume births spread evenly over the centuries.
One clean year, or two pieces
The 328-day figure is an average per lap. A single visit does not look like that. From 1600 to 2400, Jupiter made 67 visits to Aries. They fall into four kinds.
| Kind of visit | How many, 1600 to 2400 | Days spent in Aries. |
| One clean run from Pisces to Taurus | 35 visits | From 372 to 374 days each time. |
| Cut on the Pisces side, like 2022 | 16 visits | From 225 to 333 days in total. |
| Cut on the Taurus side, like 1999 | 13 visits | From 241 to 349 days in total. |
| Cut on both sides, in 2176, 2259 and 2342 | 3 visits | From 235 to 241 days, with a last scrap of 15 to 22 days. |
So a clean pass through Aries takes just over a year, 372 to 374 days. It is still the shortest clean pass of any sign. In Libra, a clean pass takes about 396 days. The split visits pull the average down. Almost half of all visits to Aries, 32 out of 67, were cut in two by a backward loop.
Two kinds of “shortest” need to stay apart here. The shortest full crossing, from Pisces straight through to Taurus, lasted 371.7 days. The shortest visit of any kind added up to only 225 days, in 2093 and 2094. The shortest single scrap was 15 days, from 17 December 2260 to 1 January 2261 in UTC. Jupiter dipped back into Aries from Taurus during a loop, then left again.
There is a neat echo in these dates. Seven laps of Jupiter take almost exactly 83 years. So the pattern repeats. The 1939 stay and the 2022 stay match almost day for day: 11 May against 10 May, 30 October against 28 October, 20 December both times, 16 May both times. A child of 2022 and a great grandparent born in late 1939 share the same Jupiter window. The 1951 clean run returns in 2034, and 1927 returns in 2010.
What the old authors gave Jupiter in Aries
Aries is the house of Mars. That is the plain rule in the Tetrabiblos of Ptolemy, in the Anthologies of Vettius Valens, and in Christian Astrology, the 1647 book by William Lilly. The Sun has its exaltation in Aries, meaning a sign where a planet was said to be raised up. Jupiter has neither of those in Aries. It is not in its detriment or its fall here either. Those are the two signs of weakness, and Jupiter’s lie in Gemini, Virgo and Capricorn. So Jupiter in Aries is a guest in the house of Mars. To read it, look at where your Mars sits. The page on Mars in Aries covers the host at home.
Jupiter does hold two smaller ranks in Aries. The first is triplicity. A triplicity is a group of three signs of one element. Aries, Leo and Sagittarius form the fire group. In Dorotheus of Sidon, whose system Valens also used, the fire group has three rulers. The Sun rules it by day, Jupiter rules it by night, and Saturn takes a share at all times. Ptolemy and Lilly keep the same day and night pair, Sun and Jupiter, and drop the third ruler. I checked this in each of the three sources, and it holds. Jupiter is the night ruler of fire in both schemes.
The second rank is the term. Terms are small slices of each sign, handed out to the five old planets. In the Egyptian terms used by Valens, and in the terms Ptolemy gave and Lilly printed, the first six degrees of Aries belong to Jupiter. Both tables agree on that slice.
What do those ranks change in practice? Chris Brennan explains that a night chart is one where the Sun sits below the horizon at birth. In such a chart, the night rulers carry more weight. So Jupiter in Aries gets its triplicity rank only for night births. I measured how that splits.
| Among births with Jupiter in Aries, at New York | Share, 1600 to 2400. |
| Born at night, so Jupiter holds its triplicity | 49.4 percent. |
| Jupiter in the first six degrees, its own term | 19.8 percent. |
| Both at once | 9.9 percent, about one in ten. |
The term share is close to one fifth, which is just the size of the slice. Jupiter does not linger in those six degrees. The night share sits near one half, because Jupiter reaches Aries in every season. Demetra George presents these small ranks as forms of support, not raw power. A planet in its own triplicity or term has friends in the room, even as a guest. For contrast, the planet that is truly weak here is Saturn, as the page on Saturn in Aries shows. For the sign where Jupiter is exalted, see Jupiter in Cancer.
Reading Jupiter in Aries in your own chart
Jupiter stands for growth, trust and the search for meaning. Liz Greene links it to faith in life. Stephen Arroyo links fire signs to drive and hope. Put Jupiter in the first fire sign and the result is simple to state. Growth comes through starting things. Trust comes from acting first and learning on the way. The Aries sign page covers the sign itself in full.
Three checks make the reading personal. None of them needs the Jupiter in Aries label alone.
- Find your Mars. Mars owns Aries, so Mars decides how freely Jupiter can act. A strong, well-placed Mars gives the guest a good host.
- Check day or night. If the Sun was below the horizon at your birth, Jupiter holds its night rank in fire. The old texts read it as a steadier helper in that case.
- Find the house. With whole sign houses, the house is the one that holds all of Aries. If Aries is your tenth house, the growth shows at work. If it is your seventh, it shows through partners.
Robert Hand reads Jupiter by transit as a time when doors open, if you walk through them. For a natal Jupiter in Aries, that fits the sign. The doors are the ones you knock on yourself. The shadow side is the same urge with no brake. People with this placement can start ten projects and finish two. The cure is not less fire. It is a plan with short steps and a date to review.
Your Jupiter return also comes in fast. Jupiter comes back to its birth place about every 11.9 years. So the return lands a few weeks before your 12th, 24th and 36th birthdays. The next sign on, Jupiter in Taurus, pulls growth the other way, toward slow and solid gain.
How I measured this
This is not a study that proves astrology. It is plain sky math that anyone can repeat.
- First route. I used the free astronomy-engine code library, version 2.1. I took Jupiter’s place as seen from Earth, corrected for the time light takes to reach us, on the tropical zodiac. I checked the sign every six hours from 1 January 1600 to 1 January 2410. Then I found each sign change to the second by halving the time step again and again.
- Days per lap. I added up the exact time spent in each sign over 67 full laps, from Jupiter’s entry into Aries on 9 May 1607 to its entry into Aries on 3 March 2402, in UTC. Then I divided by 67. A window that stops partway through a lap would give extra time to some signs.
- Second route. NASA’s JPL Horizons service, with its DE441 tables, only serves Jupiter itself from 1600 to 2200. So I used its point for Jupiter’s system as a whole, the planet and its moons. I pulled one position every three days over the same 67 laps and counted again. It gave Aries 7.566 percent, against 7.569 percent for the first route.
- Dates in the tables. Each crossing from 1904 to 2083 was timed again with Horizons, at one-minute steps. The two routes agree to within 30 minutes. The gap is largest near a stop, when Jupiter barely moves. The tables above print the Horizons times.
- Night births. I placed a birth at New York every 7 hours and 13 minutes across the whole window. For each birth with Jupiter in Aries, I checked whether the Sun sat below the horizon.
A short window would mislead you here. Jupiter’s lap does not fit a round number of years, so a span of 50 or 60 years adds an extra half lap to some signs. That is why every share on this page uses 67 full laps.
Frequently asked questions
When was Jupiter last in Aries?
From 10 May to 28 October 2022, then again from 20 December 2022 to 16 May 2023, in UTC. In New York time, the first piece ended at 1:09 a.m. on 28 October. The next stay starts on 21 April 2034.
How long does Jupiter stay in Aries?
A clean run lasts 372 to 374 days. Split visits run from 225 to 349 days in total. Averaged over 67 full laps of Jupiter, 1607 to 2402, it comes to 328 days per lap, the shortest of the twelve signs.
Why does Jupiter move fastest through Aries?
Every perihelion of Jupiter from 1600 to 2400 falls in Aries. Near the Sun, a planet speeds up. So Jupiter spends only 7.57 percent of its time in Aries, against 9.14 percent in Libra.
Is Jupiter strong in Aries?
It is a guest in the house of Mars, with no domicile or exaltation there. It does hold the night rank of the fire signs in Dorotheus, Ptolemy and Lilly, and the first six degrees as its term. It is never in detriment or fall in Aries.
I was born in November 2022. Do I have Jupiter in Aries?
No. From 28 October to 20 December 2022, Jupiter was back in the last degrees of Pisces. Births from 20 December 2022 to 16 May 2023 do have Jupiter in Aries.
Is Jupiter in Aries rare?
It is the least common Jupiter sign, but only by a little. About 76 people in 1,000 have it, against 83 for an even share.
Go further with your own chart
The dates tell you whether you have Jupiter in Aries. Your full chart tells you what it does: where your Mars sits, whether you were born by day or by night, and which house Aries rules. An Astrovision report reads all of that for you, as a written guide and a personal podcast.