Libra and Libra compatibility sounds like the calmest match in the zodiac. Two people who love fair play, good taste and a quiet room. Sign books stop there. We wanted numbers you can check. So we asked three plain questions. How many US couples are two Libras? How close are their Suns? And do they share the planet that rules them both?
The third answer was the surprise. Two Libras share a Venus sign in about one couple in four. But that figure hides a clock. Born the same year, they match six times in ten. Born four years apart, they match about one time in eighteen. Born eight years apart, the match is back to six in ten. Your age gap does more to line up your Venus signs than your birthdays do.
First, a fair warning. Astrology is not a science. No study has shown that Sun signs predict how a couple does. Read what follows as a lens, a way to talk about a bond. It is not a forecast.
The quick answer
- Two Libras make about 1 US couple in 138, from 62.2 million US births.
- That is the fifth most common same sign pair, and the last one above an even split.
- The largest test of love signs, ten million marriages, found no pull between same sign partners.
- Two Libra Suns sit within 8 degrees of each other in 46 percent of couples.
- Two Libras share a Venus sign in 24 percent of pairs over the long run.
- Born the same year, that climbs to 61 percent. Born four years apart, it drops to 6 percent.
How common is a Libra and Libra couple?
Start with the birth count. If signs were even, each would hold one twelfth of births. A same sign couple would then be 1 in 144. Real births are not even. More babies arrive in late summer and early fall. Fewer arrive in winter.
We used the daily US birth counts from the Social Security Administration for 2000 to 2014. That is 62.2 million births, day by day. FiveThirtyEight made the file public. We turned each day into signs with the real moment the Sun changes sign. Libra holds 8.52 percent of US births. That is a bit more than one in twelve.
For two random people to both be Libras, you multiply that share by itself. The result is 0.73 percent. That is about 1 couple in 138. A second file, from the National Center for Health Statistics for 1994 to 2003, gives 1 in 138 as well.
| Same sign couple | How common in the US. |
|---|---|
| Leo and Leo | About 1 couple in 125. |
| Virgo and Virgo | About 1 couple in 125. |
| Cancer and Cancer | About 1 couple in 128. |
| Gemini and Gemini | About 1 couple in 136. |
| Libra and Libra | About 1 couple in 138. |
| An even split of signs | Exactly 1 couple in 144. |
| Taurus and Taurus | About 1 couple in 145. |
| Capricorn and Capricorn, the rarest | About 1 couple in 172. |
So Libra and Libra is the last same sign pair on the heavy side of the scale. Every same sign pair below it is rarer than an even split. The gap is small, though. It comes from the September birth peak, not from anything in the stars. Our zodiac signs guide explains why the sign dates shift from year to year.
Does like attract like?
A birth count tells you how common the pair is. It does not tell you if Libras seek out Libras. For that, the best test we know is British.
In 2007, the sociologist David Voas studied the 2001 census of England and Wales. He had the birth dates of both partners in 10.3 million married couples. His paper is called “Ten million marriages: a test of astrological love signs.” The Skeptical Inquirer ran a version in March 2008.
The raw table showed about 22,100 more same sign couples than chance. Voas traced them to the census form, not the sky. Some people wrote their own birthday twice. Some used January 1 when a date was unknown. Once he fixed those slips, same sign couples were no more common than chance. Our page on Virgo and Virgo compatibility walks through each slip in detail.
So the plain answer is no. Two Libras do not find each other more than chance says. When they do meet, the rest of this page is about what they share.
Same sign, but how close are the two Suns?
A sign is 30 degrees wide. Two people can both be Libras and still have Suns far apart. One born on September 23 and one born on October 22 have Suns about 29 degrees apart.
Astrologers call two points within a few degrees a conjunction. It means the two sit side by side. Most use a limit of about 8 degrees for the Sun. We measured the gap between two Libra Suns, weighted by real US births.
| Gap between the two Libra Suns | Share of Libra couples. |
|---|---|
| Within 3 degrees | About 19 percent of couples. |
| Within 6 degrees | About 36 percent of couples. |
| Within 8 degrees, a true conjunction | About 46 percent of couples. |
| Within 10 degrees | About 55 percent of couples. |
| Average gap | About 10 degrees. |
So fewer than half of Libra couples have a true Sun conjunction. The rest share a sign, but not a close degree. This share is the same for every same sign pair, since each sign is 30 degrees wide.
In calendar terms, two Libras share a birthday in about 1 couple in 31. For two random people, the odds are 1 in 365. About 43 percent of Libra couples have birthdays within a week of each other. The average gap is about 10 days.
Venus, the ruler you share
Each sign has a ruling planet. The ruler is the planet the sign belongs to, like an owner to a house. Venus rules Libra. Ptolemy gives it to Venus in his Tetrabiblos, Book 1, chapter 17. So a Libra couple shares a ruler. That makes Venus the natural place to look next.
Here is the catch. Venus orbits closer to the Sun than we do. From Earth, it never strays more than about 47 degrees from the Sun. That is a bit over a sign and a half. So a Libra Sun can have Venus in only five signs: Leo, Virgo, Libra, Scorpio or Sagittarius.
Our Libra sign page measured the split over 800 years, from 1600 to 2400. Venus lands in Virgo for 29.24 percent of Libras. It lands in Scorpio for 28.97 percent and in Libra for 23.52 percent. Leo and Sagittarius take about 9 percent each.
Now put two Libras side by side. If you pick them at random over those 800 years, they share a Venus sign 24 percent of the time. Both have Venus at home in Libra 5.5 percent of the time. That is about 1 couple in 18.
The age gap that decides your Venus match
Real couples are not picked at random across 800 years. Most partners are born a few years apart. And Venus runs on a clock. So we asked a sharper question. Does the gap in birth years change the odds that two Libras share a Venus sign?
It changes them a lot. We took every Libra season from 1600 to 2400. For each one, we found the Venus sign every six hours. Then we paired each season with the one a set number of years later.
| Years between the two Libra births | Same Venus sign | Both with Venus in Libra. |
|---|---|---|
| Same year | 61 percent of pairs | 15 percent of pairs. |
| One year apart | 9 percent of pairs | 3 percent of pairs. |
| Two years apart | 19 percent of pairs | 2 percent of pairs. |
| Three years apart | 38 percent of pairs | 8 percent of pairs. |
| Four years apart | 6 percent of pairs | 5 percent of pairs. |
| Five years apart | 37 percent of pairs | 8 percent of pairs. |
| Six years apart | 20 percent of pairs | 2 percent of pairs. |
| Seven years apart | 9 percent of pairs | 3 percent of pairs. |
| Eight years apart | 61 percent of pairs | 14 percent of pairs. |
| Any gap, picked at random | 24 percent of pairs | 6 percent of pairs. |
Read the table as a wave. The match is high at zero years, low at one, middling at three, and near the floor at four. Then it climbs back and peaks again at eight. From there it repeats.
The four year row hides a neat detail. At that gap, the pair almost never shares Venus in Virgo or Scorpio. Nearly every match left is a couple where both have Venus at home in Libra.
Why eight years repeats and four years flips
Venus laps the Sun, as seen from Earth, once every 584 days. Five of those laps take 2,920 days. Eight years take 2,922 days. The two are only two days apart. So every eight years, Venus comes back to nearly the same place on the same date. Two Libras born eight years apart get almost the same Venus.
Four years is half of that cycle. After four years, Venus is on the other side of the Sun. If one partner had Venus trailing the Sun, in Virgo or Leo, the other has it running ahead, in Scorpio or Sagittarius. The only place they can meet is Libra, right beside the Sun.
Born the same year, both Libra birthdays fall within one month. Venus moves a bit more than one degree a day. So in one month, it has not gone far. Most same year Libras land in the same Venus sign.
This is a real sky fact, not a claim about love. It says where Venus sits. What that means for a couple is a matter of reading, and readers differ.
What the old books say about Libra with Libra
Ptolemy lists four sign aspects in Book 1, chapter 13. An aspect is a set angle between two signs. His four are the opposition, the trine, the square and the sextile. Two people in the same sign are not in that list. Later writers treat it as a conjunction, a blend of two alike things.
The old books give Libra a few more tags. It is an air sign. Ptolemy gives the air signs to Saturn by day and to Mercury by night. He also names Libra as the exaltation of Saturn, a seat of honor, and the fall of the Sun, a seat of weakness. His reason is the season. At Libra, days grow shorter than nights.
William Lilly, writing Christian Astrology in London in 1647, gives the seventh house marriage, contracts, lawsuits and open enemies. Modern writers link Libra, the seventh sign, to that same house of the partner. So two Libras bring two people who think in pairs into one pair.
Stephen Arroyo, in Astrology, Psychology and the Four Elements, links the air signs to ideas and to the way we relate. Robert Hand, in Horoscope Symbols, reads a conjunction as a blend of two energies. Those are ways of reading, not findings.
Two Libras in daily life
Read as a symbol, a Libra couple starts with a lot in common. Both like to weigh both sides. Both care how a room looks and how a guest feels. Both prefer a calm talk to a slammed door.
That shared taste makes the easy parts easy. Plans for a trip, a home, or a party come together fast. Friends like to visit.
The Venus clock adds a layer. Two Libras with the same Venus sign share a style of affection as well as a Sun. Two with different Venus signs share the Sun but show love in different ways. One with Venus in Virgo shows care through help and detail. One with Venus in Scorpio shows it through depth and loyalty. Neither is better. They are two dialects of one language.
Where the friction shows up
The same traits have a cost when there are two of them. Both partners want to keep the peace. So a small problem can sit unspoken for weeks. Both want to be fair. So a choice between two good options can stall.
Here are simple habits that help a pair like this:
- Take turns making the final call on small things.
- Set a time limit on choices that do not matter much.
- Say the hard thing early and in a kind voice.
- Check in once a week about plans and needs.
- Talk about money and chores before they turn into a silent tally.
None of this is special to Libras. It is plain good sense for any couple. The sign only names the trap you are most likely to see.
The rest of the chart counts for more
A Sun sign is one point among many. Your Moon sign, your Venus sign and your Mars sign all add their own notes. Two Libras can have very different charts once you look past the Sun.
The emotional side lives with the Moon. Our page on Libra and Libra Moon signs covers that. The romantic side lives with Venus. For two partners whose Venus is in Libra, see Libra and Libra Venus placements. And if one of you is on the Virgo edge, our page on Virgo and Libra compatibility shows how Venus crosses between the two signs.
To check your own Venus sign, you need your birth date and a chart. Then look at your partner’s. Count the years between your births. The table above tells you how common your match is.
How we measured
Birth shares. We used the SSA daily birth counts for 2000 to 2014, 62.2 million births. We split each day on US Central time and gave each slice the sign the Sun was in. Libra came out at 8.52 percent. The NCHS file for 1994 to 2003, 39.7 million births, gave 8.51 percent. The couple odds are that share times itself.
Sun gaps. We placed each Libra birth on a grid of one hundredth of a degree. Then we compared every pair. We did this twice, with the Swiss Ephemeris on the SSA file and with the Astronomy Engine library on the NCHS file. The two agree to within half a point.
Venus match. For each year from 1600 to 2410, we found the Libra season and read the Venus sign every six hours with Astronomy Engine. Then we compared each season with the one a set number of years later, for base years 1600 to 2399. A second pass used the Swiss Ephemeris, a different time step of about ten hours, and its own search for the start of Libra. The two passes agree to within 0.03 points on every row.
What we did not measure. We did not weight the age gaps by how common they are in real US couples. We give the odds for each gap, so you can read your own row.
Questions people ask
Are two Libras compatible?
No study has found that Sun signs predict how a couple does. As a symbol, two Libras share a ruler, Venus, and a love of fair play. Their main risk is avoiding hard talks. Their Moon and Venus signs say more than the shared Sun.
How common is a Libra and Libra couple?
About 1 couple in 138 in the US, or 0.73 percent of random pairs. That is based on 62.2 million US births from 2000 to 2014. An even split of signs would give 1 in 144.
Do two Libras share the same Venus sign?
About one pair in four, over the long run. It depends on your age gap. Born the same year or eight years apart, two Libras match about six times in ten. Born four years apart, they match about one time in eighteen.
Why does an eight year gap matter for Venus?
Five laps of Venus take almost exactly eight years. So Venus comes back to nearly the same spot on the same date every eight years. Two Libras born eight years apart get almost the same Venus.
Is a Libra and Libra couple a conjunction?
Only for some. The two Suns sit within 8 degrees in about 46 percent of Libra couples. The rest share the sign but not a close degree.
Do Libras marry other Libras more than chance?
No. A study of 10.3 million marriages in England and Wales found no such pull once form errors were fixed.
Go deeper with your personal Astrovision report
Reading about a sign pair is a good start. Your own chart says far more. An Astrovision report looks at your Sun, Moon, Venus and the rest, and tells you what they mean for you. It comes as a written guide and as a personal podcast. Our users call it friendly, personal and easy to understand.