Mars sits in Aquarius in about one birth chart in 15. That makes it one of the two rarest Mars signs, level with Pisces. I measured it over 800 years of sky, two ways, and the two counts agree to a hair. This page gives you that number, the dates Mars was in Aquarius from 2016 to 2030, and the one thing most guides skip: Saturn, the planet that owns the sign, and where it stands when Mars moves in.
Mars is the planet of drive, anger and desire. In a birth chart, its sign shows the style of that drive. Aquarius is the air sign of groups, rules, plans and ideas. So Mars in Aquarius is a drive that runs on a cause. The numbers below show why it is also a fast, short, rare visit.
The key numbers at a glance
- Share of time Mars spends in Aquarius, from 1600 to 2400: 6.84 percent, or one chart in 15.
- Rank among the twelve signs: tied for last with Pisces, at 6.82 percent.
- Normal visit: 38 to 56 days, with a middle value of 39 days.
- Longest visit: about six months, when Mars turns back inside the sign.
- Last time Mars turned back in Aquarius: June 2018. Next time: July 2050.
- Charts where Mars cannot see Saturn, its ruler: one in three.
How rare is Mars in Aquarius?
If Mars spent the same time in every sign, each sign would get 8.33 percent of charts. It does not. Mars moves at an uneven pace, so some signs get far more time than others.
To count this fairly, I took the full span from the year 1600 to the year 2400. That is 800 years, or about 425 trips of Mars around the zodiac. A short window can fool you. From 1950 to 2010, Aquarius alone looks rarest, at 6.6 percent. Over 800 years, Pisces and Aquarius finish in a dead heat.
Here is the full table. The middle column is the share of all time Mars spends in each sign. The next column is the typical length of one visit. The last one counts how many times Mars stopped and turned back in that sign in the 800 years.
| Sign | Share of time | Typical visit | Turns back there. |
|---|---|---|---|
| Pisces | 6.82 percent | 39 days | 19 times. |
| Aquarius | 6.84 percent | 39 days | 20 times. |
| Aries | 7.16 percent | 40 days | 20 times. |
| Capricorn | 7.21 percent | 40 days | 24 times. |
| Taurus | 7.74 percent | 42 days | 24 times. |
| Sagittarius | 7.85 percent | 42 days | 30 times. |
| Gemini | 8.58 percent | 45 days | 31 times. |
| Scorpio | 8.74 percent | 45 days | 38 times. |
| Cancer | 9.40 percent | 47 days | 35 times. |
| Libra | 9.58 percent | 47 days | 43 times. |
| Leo | 10.00 percent | 49 days | 44 times. |
| Virgo | 10.07 percent | 49 days | 46 times. |
So a person with Mars in Virgo is about one and a half times as common as a person with Mars in Aquarius. The gap between Aquarius and Pisces is two parts in ten thousand. That is a tie. Which of the two wins depends on the century you pick. From 1600 to 2000, Pisces is a touch rarer. From 2000 to 2400, Aquarius is.
Mars in Aries sits just behind the pair, at 7.16 percent, and our page on how rare Mars in Aries really is tells that side of the story.
Why Mars rushes through Aquarius
Mars does not orbit the Sun in a clean circle. Its path is a stretched loop. At one end it swings close to the Sun and speeds up. At the far end it drifts out and slows down. The close point is called perihelion, a Greek word that means “near the Sun”.
Seen from the Sun, the close point of Mars lies at about 336 degrees of the zodiac in our time. That is six degrees into Pisces, right next to the line with Aquarius. So the two signs on each side of that line are where Mars moves fastest. Fast motion means a short stay, and a short stay means fewer charts. The slow end of the loop sits across the sky, in Leo and Virgo, and those two signs hold Mars the longest.
The same fact explains the last column of the table. Mars turns back when Earth, on the inside track, passes it. That event is spread out where Mars is fast and bunched up where Mars is slow. So Aquarius gets few of them.
A visit lasts 38 to 56 days, unless Mars turns back
In 800 years, Mars made 425 passes through Aquarius. In 307 of them, the visit took less than 41 days. In 364 of them, it took less than 45 days. When Mars moves straight through, the visit runs from 38 to 56 days. The 56-day case came in 2003, from 21 April to 17 June, when Mars was slowing down before a turn in Pisces.
Only 26 of the 425 passes held a backward phase. Astrologers call that backward phase retrograde. It is a trick of view, like a car you pass on the highway that seems to slide back. Mars does not really reverse. But in the chart it goes back over the same degrees, and the stay grows to five or six months.
Here are the long stays of the last 100 years, and the next two.
| Long stay of Mars in Aquarius | What happened. |
|---|---|
| 3 May to 6 November 1971 | Mars turned back at 22 degrees of Aquarius on 11 July and moved forward again on 9 September, all inside the sign. |
| 16 May to 15 November 2018 | Mars turned back at 9 degrees on 26 June, slid back into Capricorn from 13 August to 11 September, then came back. |
| 29 April to 31 October 2050 | Mars will turn back at 27 degrees on 15 July and move forward at 17 degrees on 13 September. |
| 9 May to 11 November 2097 | Mars will turn back at 14 degrees on 30 June, all inside the sign. |
The gaps between these turns run 47 years, then 32, then 47. That rhythm comes from a 79-year cycle: after 79 years, Mars and Earth line up in almost the same way again. So Mars turns back in Aquarius about twice in each 79 years. In 800 years it did so 20 times, out of 374 turns in all.
If you were born in the summer of 1971 or of 2018, your Mars in Aquarius was slow or moving back. That is a Mars that goes over the same ground twice. Most people with this placement have the opposite: a quick Mars that came in and left inside six weeks.
Dates of Mars in Aquarius, 2016 to 2030
Times are in UTC, the world clock. If you were born on the first or last day of a range, check your birth hour against it. New York is four or five hours behind UTC, and Los Angeles is seven or eight hours behind.
| Mars enters Aquarius | Mars leaves Aquarius | Where Saturn stands. |
|---|---|---|
| 9 November 2016, 05:50 | 19 December 2016, 09:23 | In Sagittarius, a friendly link. |
| 16 May 2018, 05:00 | 15 November 2018, 22:20 | In Capricorn, with no link. |
| 30 March 2020, 19:43 | 13 May 2020, 04:18 | In Aquarius, with Mars. |
| 6 March 2022, 06:22 | 15 April 2022, 03:04 | In Aquarius, with Mars. |
| 13 February 2024, 06:04 | 22 March 2024, 23:47 | In Pisces, with no link. |
| 23 January 2026, 09:16 | 2 March 2026, 14:15 | In Pisces, then Aries from 14 February. |
| 3 January 2028, 16:00 | 10 February 2028, 16:31 | In Aries, a swap of houses. |
| 13 December 2029, 05:24 | 20 January 2030, 10:26 | In Taurus, a tense link. |
In 2018, the stay was broken. Mars left Aquarius on 13 August and went back into Capricorn, then came home on 11 September. If you were born in that gap, your Mars is in Capricorn, where it plays by other rules. Our guide to Mars in Capricorn covers that sign.
The last column needs a word. It is the key to this whole placement, and the next two sections explain it.
A guest with no papers: what the old books say
Old astrology gives each planet a score in each sign. The score is called dignity. It tells you how much the sign backs the planet. There are five kinds. A planet can own the sign, which is called domicile. It can be a guest of honour, which is called exaltation. It can share in the element, which is called triplicity. And it can own a small slice of the sign, either a term of a few degrees or a face of ten degrees.
Claudius Ptolemy set out this scheme in the Tetrabiblos, written in Alexandria around 150 AD. He gives Aquarius to Saturn. Mars owns Aries and Scorpio. It is exalted in Capricorn. For the air signs, the triplicity goes to Saturn by day and Mercury by night. The faces of Aquarius go to Venus, Mercury and the Moon. Mars gets none of these.
William Lilly, in Christian Astrology of 1647, has a word for a planet with no dignity at all. He calls it peregrine, which means a foreigner or a wanderer. So Mars in Aquarius is peregrine for most of the sign. There is one small exception. Lilly gives Mars the last five degrees of Aquarius, from 25 to 30, as its term. The older Egyptian table, which Vettius Valens uses in his Anthologies, gives Mars the degrees from 20 to 25 instead. Either way, about one Mars in Aquarius in six sits in its own term. I measured that share at 16.4 percent of the time.
Note what this does not mean. Mars is not in detriment in Aquarius, and it is not in fall. Those are the two bad seats, and they sit in Libra, Taurus and Cancer. A peregrine planet is not weak. It is a guest with no host of its own. So everything turns on the host, and the host of Aquarius is Saturn.
Saturn holds the keys
In the Hellenistic tradition, the planet that owns a sign is the lord of any planet that sits there. Astrologers call it the ruler or the dispositor. Think of a tenant and a landlord. Mars rents the room. Saturn owns the house. Whatever Mars wants to do, Saturn has a say in how it goes.
Chris Brennan, in Hellenistic Astrology, and Demetra George, in Ancient Astrology, both stress one test here. Can the tenant see the landlord? Two signs see each other when they are linked by an aspect: the same sign, or 60, 90, 120 or 180 degrees apart. If they are not linked, the old texts call it aversion. The two planets turn their backs to each other. The landlord cannot watch over the room.
From Aquarius, four signs are in aversion: Capricorn, Pisces, Cancer and Virgo. So I measured where Saturn stands during every hour Mars spends in Aquarius, over the same 800 years.
| Where Saturn stands, seen from Mars in Aquarius | Share of the time. |
|---|---|
| In Aquarius too, the same room | 9.7 percent. |
| Sixty degrees away, in Aries or Sagittarius | 16.6 percent. |
| Ninety degrees away, in Taurus or Scorpio | 17.1 percent. |
| One hundred and twenty degrees away, in Gemini or Libra | 16.9 percent. |
| Across the sky, in Leo | 6.4 percent. |
| In aversion, in Capricorn, Pisces, Cancer or Virgo | 33.2 percent. |
So in one chart in three with Mars in Aquarius, Mars cannot see its landlord. That is no quirk of this sign. Four of the twelve signs are always in aversion, and four in twelve is one in three. The count simply lands where chance puts it. Saturn moves on its own clock. It does not wait for Mars.
The odd case is Saturn in Capricorn, at 10.9 percent. There Saturn is at home in its own house, yet it cannot see Mars. The landlord is in the next room with no window. The 2018 stay was like that, for all six months.
Two better cases: the swap and the shared room
In 16.1 percent of the time, Saturn stands in Aries or Scorpio. Those are the two signs Mars owns. So each planet sits in the house of the other. Lilly calls that mutual reception, and he counts it as real help: two hosts who each hold the key to the other’s door. This happened from 14 February to 2 March 2026. It will hold for the whole stay from 3 January to 10 February 2028.
In 9.7 percent of the time, Saturn and Mars share Aquarius. Then the landlord lives in the same room. This happened in 2020 and in 2022. Mars met Saturn on 31 March 2020 and again on 5 April 2022. Those are the two planets the old books call the malefics, the hard ones. In one room, they make a drive that is slow to start and hard to stop.
And Uranus?
Modern astrology adds Uranus as a second ruler of Aquarius. Uranus was found in 1781. It stands in Aquarius in just 8.1 percent of the time Mars is there. The last Mars stays with Uranus at home came between 1996 and 2001. The next ones come between 2080 and 2086. So for nine people in ten with Mars in Aquarius, the modern ruler is away too. Our guide to the Aquarius sign shows how seldom Uranus is home for anyone born there.
Reading Mars in Aquarius in your chart
Mars shows how you go after what you want. Aquarius puts that drive to work for a plan, a group or a rule you think is fair. Stephen Arroyo reads each planet through the element of its sign, and air is the element of thought and talk. So this Mars argues before it acts. It fights for a cause more than for itself. When it is angry, the anger comes out cold: a sharp remark, a flat no, or a sudden exit.
Robert Hand, in Planets in Transit, reads Mars as the urge to act on your own will. In Aquarius that urge gets filtered through a sense of what is right for the group. Liz Greene, in her book on Saturn, links Saturn to the part of us that builds walls and sets limits. Put the two together and you get a drive that wants a system. It wants to change the rules, not just to break them.
Then look at Saturn in your chart. The three cases above change the reading.
- Saturn in the same sign, or linked by an aspect: Mars has a boss who can see it. The drive gets shape, a plan and a deadline. It can feel strict, but it gets things done.
- Saturn in Aries or Scorpio: the swap. Each planet backs the other. This is the strongest form of the placement in the old scoring.
- Saturn in aversion: Mars runs with no one watching. It is free, and it is also on its own. The drive can stall, or it can go off in a new line that no one saw coming.
Then look at the house. Mars in Aquarius shows its drive in the part of life ruled by the house it sits in. In the tenth house, it is a drive for a public cause. In the seventh, the drive shows up in how you handle a partner. The sign gives the style. The house gives the stage.
Mars in Libra, the other air sign, handles desire through a pair instead of a group: see Mars in Libra for that contrast. Mars in Pisces, the other half of the tie for rarest, has its own story in Mars in Pisces. For the planet itself, start with our page on Mars.
How I measured this
A number you cannot check is worth little, so here is the method.
Route one. I used the open code library Astronomy Engine to work out where Mars stands, seen from Earth, in the tropical zodiac. I stepped through time every half day from 1 January 1600 to 1 January 2400. Each time Mars changed sign, I cut the gap in half, again and again, until I had the time of entry to within one second. Adding up the time between entries gives the share for each sign. The same run found each point where Mars stops and turns, and the Saturn figures come from a sample every six hours inside each Mars stay.
Route two. I asked NASA’s JPL Horizons service for the place of Mars and of Saturn at midnight on each of the 292,194 days from 1600 to 2400. That is a different model of the planets, from a different team. It gives 6.84 percent for Mars in Aquarius and 6.83 percent for Pisces. Route one gives 6.84 and 6.82. The Saturn shares agree to within 0.1 of a point. Each date in the tables above falls on the same day in both routes.
Signs are the tropical signs used in Western astrology, starting at the spring equinox. Houses are whole signs. The window is 800 years because a short one lies. Over the 60 years from 1950 to 2010, you would get 6.6 percent and think Aquarius stood alone.
Frequently asked questions
How rare is Mars in Aquarius?
Mars spends 6.84 percent of its time in Aquarius, measured from 1600 to 2400. That is about one birth chart in 15. It ties with Pisces for the rarest Mars sign.
How long does Mars stay in Aquarius?
Most visits last 38 to 56 days, and the middle value is 39 days. When Mars turns back inside the sign, as in 1971, 2018 and 2050, the stay runs to about six months.
When is Mars next in Aquarius?
From 3 January to 10 February 2028, then from 13 December 2029 to 20 January 2030. The last stay ran from 23 January to 2 March 2026.
Is Mars weak in Aquarius?
No. Mars has no dignity there, which Lilly calls peregrine, but it is not in detriment or in fall. Its strength depends on Saturn, the ruler of Aquarius, and on whether Saturn can see it.
Who rules Mars in Aquarius?
Saturn, in the old system of Ptolemy. Modern books add Uranus. Saturn can see Mars in about two charts in three with this placement, and not in the other third.
Is Mars in Aquarius the same as Mars in Capricorn?
No. Both signs belong to Saturn, but Mars is exalted in Capricorn, a guest of honour. In Aquarius it is a guest with no rank. Capricorn gives Mars a ladder to climb. Aquarius gives it a cause.
Go deeper with your personal Astrovision report
A general page gives you the pattern. Your own chart shows where your Mars sits, which house it works in, and where your Saturn stands. Our audio-first reports walk you through each of those links, with steps you can use right away.