How Rare Is Your Chart Pattern? We Counted 100,000 Charts
Yods, grand crosses, T-squares, stelliums: how common each one really is, measured across 100,000 birth charts, and what it means if you have one.
If you’ve ever typed your birth details into a website and been told you have a “rare” Yod or a “powerful” Grand Cross, you might have felt a little flutter. Maybe pride. Maybe worry. Maybe both at once.
I know that feeling well. When I first worked out my own chart, one of my patterns came out at 1 in 68,000. I was rather pleased with that. Then I measured it properly, and it came out at about 1 in 500. Still uncommon, but a very different thing to be told.
So I wanted to give you the real numbers. Not guesses, and not the flattering version. We took 100,000 random birth charts, people born anywhere from 1930 to 2025 in 42 places around the world, and simply counted how often each pattern turns up.
Here’s what we found.
The short answer
| Pattern | How many charts have one | How many have a tight one (every side within 1°) |
|---|---|---|
| T-square | 86 in 100 | 8 in 100 |
| Yod | 41 in 100 | 8 in 100 |
| Grand trine | 39 in 100 | 2 in 100 |
| Kite | 22 in 100 | about 1 in 410 |
| Stellium | 20 in 100 | about 1 in 520 (all four planets within 5°) |
| Grand cross | 14 in 100 | about 1 in 660 |
| Mystic rectangle | 14 in 100 | about 1 in 900 |
And the figure that surprised me most: 96 in 100 charts have at least one of the triangle or square shapes (the T-square, yod, grand trine, kite, grand cross, mystic rectangle, or a gentler one called a cradle).
So if you have one, you’re in very good company. Having a pattern isn’t unusual. Having a tight one is.
How to read the shapes
If you’re new to this, here’s everything you need in two minutes.
A birth chart is a circle. It’s a map of the sky at the moment you were born, drawn as a wheel. The Sun, the Moon and the planets each sit at their own point around that wheel.
Each planet stands for a part of you. Very roughly: the Sun is your sense of who you are, the Moon is your feelings and what you need to feel safe, Mercury is how you think and talk, Venus is what you love and value, Mars is your drive, and so on out to the slow planets.
What matters is the angle between them. When two planets sit at certain distances apart around the circle, those two parts of you are linked, and the kind of link depends on the distance. There are five that make up all the patterns below:
Opposite (180°)Square (90°)Trine (120°)Sextile (60°)Quincunx (150°)
- Opposite (180°), across the circle. A pull between two things, like a see-saw. Both sides want your attention.
- Square (90°), a quarter of the way round. Friction. The two rub against each other, and that rubbing tends to push you into doing something.
- Trine (120°), a third of the way round. Ease. The two work together without much effort.
- Sextile (60°), a sixth of the way round. An opening. A helpful link that works best when you use it.
- Quincunx (150°), almost opposite but not quite. Two things that never quite fit together, so you keep adjusting between them.
A pattern is just several of these links joined into a shape. Once you know the five links, every pattern explains itself. A grand cross, for example, is two see-saws crossing each other, with friction all the way round.
The planets give each shape its flavour. The same shape can feel very different depending on what’s in it. A T-square that includes your Moon is likely to be about feelings and needs. One built around Saturn is more about pressure and responsibility. So the descriptions below are the general feel of each shape, and your own version depends on which parts of you it joins.
Why “tight” is the part that matters
Most websites count a pattern as long as the planets are roughly in the right places, often allowing several degrees of wiggle room. That’s a bit like saying two people “arrived together” because they turned up on the same afternoon.
When the planets in a pattern sit very close to the exact angles, within a degree or so, the pattern tends to be much more noticeable in a person’s life. It’s the difference between a song playing quietly in another room and the same song playing right next to you.
That’s why the second column in the table matters more than the first. A T-square is in 86 charts out of 100. A T-square with every side within one degree is in about 8.
A gentle note before you read on
Some of these patterns have scary-sounding reputations online. Words like “tension”, “crisis” and “fate” get used a lot.
Please don’t take any of that as a judgement on you. A pattern in a chart describes a way energy tends to move, not a sentence passed on your life. It doesn’t explain away anything that has happened to you, and it doesn’t decide what happens next. You’re the one living your life, and you get the final word on what fits.
If any of this touches something tender, it’s fine to stop, skip ahead, or come back another day.
What each pattern is, in everyday words
T-square: 86 in 100
The shape: two planets pull in opposite directions, and a third sits between them, a square from each, feeling the push from both sides.
In everyday terms, it often feels like being asked to hold two things at once and being the one who makes it work. Lots of people with a T-square describe themselves as the person who gets things done when others are stuck. It can also be tiring, and it’s okay to say so.
The empty point opposite the third planet (the faint circle) is often seen as the missing piece, the thing that helps the whole shape settle when you find your way to it.
Check whether you have a T-square
Yod: 41 in 100
The shape: two planets with a helpful link between them (a sextile) both sit at that “never quite fits” angle, a quincunx, from a third. On the wheel it looks like a long, thin arrow. People sometimes call it the “Finger of God”, which makes it sound more dramatic than it needs to be.
The way I’d describe it: a part of you that never quite fits the usual boxes, and keeps adjusting until it finds its own way. The planet at the point of the arrow is where that adjusting tends to show up most. I have a double yod in my own chart (about 1 in 470), and that sense of always adjusting is one of the most familiar things in my life.
Grand trine: 39 in 100
The shape: three planets spaced evenly around the wheel, each a trine from the other two, making an equal-sided triangle. This is the easy, flowing one. Things in that area of life can come naturally.
The honest flip side is that easy things don’t always get used. A grand trine is often a gift a person forgets they have, until someone else points it out.
Check whether you have a grand trine
Kite: 22 in 100
The shape: a grand trine with a fourth planet added. It sits opposite one corner of the triangle, and has a helpful sextile link to the other two.
On its own, a grand trine can just sit there being easy. The fourth planet adds a pull, and that pull gives the ease somewhere to go, like the tail and string that let a kite actually fly instead of lying on the grass. People with a kite often find their natural gifts come alive when there’s something they care about pulling them forward. The planet at the tail is usually where that “something to aim for” shows up.
Stellium: 20 in 100
The shape: not really a shape at all. It’s four or more planets bunched together in one sign, a single twelfth of the wheel.
It’s like a lot of your attention living on the same street. Whatever that sign is about tends to be a big theme for you, because so many parts of you are gathered there.
Worth knowing: a stellium is often partly shared with everyone born around the same time, because the slow outer planets stay in one sign for years. So part of yours may be a generational thing, and part of it is just yours. The calculator tells you which is which.
Check whether you have a stellium
Grand cross: 14 in 100
The shape: four planets a quarter of the way round from each other, making a square. That gives two see-saws crossing in the middle, with friction all the way round the edge.
It’s often described as the most intense pattern, and I’d put it more gently than that. It’s a bit like standing at a crossroads where all four roads matter to you. There’s no easy way out of a grand cross, because every direction pulls against another one, so instead it tends to teach balance.
People with a grand cross often become very good at holding a lot at once. That’s real strength, even on the days it doesn’t feel like it.
Check whether you have a grand cross
Mystic rectangle: 14 in 100
The shape: four planets making a rectangle. Across the middle are two see-saws, two pulls. Around the edges, though, every corner is linked to its neighbours by easy trines and helpful sextiles.
So it’s a pattern of tension that comes with its own support built in. The pulls are real, but there’s always a way round, a bit like a difficult conversation between people who still like each other. People with a mystic rectangle often find they can hold quite a lot of inner contradiction without falling apart, and over time that can look like a quiet, practical sort of wisdom.
Check whether you have a mystic rectangle
What if I have one of the rare ones?
Then it’s genuinely uncommon, and it’s worth looking at more closely. But rare doesn’t mean better, and it doesn’t mean harder. It just means that description is more specifically yours, and fewer people share it.
What if mine are all common?
Then you’re like almost everyone. A common pattern isn’t a lesser one. A T-square that 86 in 100 people share can still be one of the loudest things in your life, especially if it’s tight.
The more useful question isn’t “is it rare?” It’s “is it tight, and does it involve the parts of my chart that are most personal to me?” Those are the Moon and the rising sign, the parts that depend on your exact birth time.
How we counted
For anyone who likes the detail: we generated 100,000 birth moments at random, from 1930 to 2025, across 42 locations. Each chart went through exactly the same pattern finder the site uses on yours, and we counted how often each pattern appeared at each level of tightness. Nothing in the table is estimated from a formula. It’s a straight count.
If you’d like the longer story of why so many “one in a million” claims online are wrong, I wrote about that in How rare is your birth chart?
If you’d like to see which of these are in your own chart, and how tight they are, you can see your free chart. If nothing in it is rare, we’ll tell you that honestly, and we’ll still show you what stands out, and which parts of you each pattern joins.