Square in astrology: the aspect that gets things moving
A square is when two planets sit 90° apart, a quarter of the way around the zodiac. The two planets want different things and neither will politely wait its turn. That friction can be uncomfortable, and it’s also the engine behind a great deal of what people build, learn and become.
Square at a glance
- Angle
- 90°
- Symbol
- A small square
- Hali’s orb
- 7°, or 9° when the Sun or Moon is involved
- Nature
- Tension that pushes action
- Traditional family
- Hard, alongside the opposition
- Signs it links
- Signs of the same mode but clashing elements
What does a square mean in astrology?
It means two parts of you are standing at a right angle, each sure the other is in the way. If your Moon is square Saturn, your need for comfort and your sense of duty can feel like two flatmates arguing over the thermostat. Neither is wrong. They just keep meeting in the hallway.
A square isn’t a flaw or a punishment. It’s a place in your chart that won’t let you coast. People often describe their squares as the thing they struggled with early and later became good at, because they had to practise it so many times.
Venus square Mars, for example, can bring sparks to love, the kind of chemistry that includes a little bickering. The Sun square Jupiter can make you want more of everything, which is a lovely quality right up until the moment you agree to four projects at once.
Why do squares feel tense?
Because of the signs they usually connect. Two planets 90° apart tend to fall in signs three apart, and those signs share a mode but belong to elements that don’t naturally mix. Fire meets water, or earth meets air.
So a planet in Aries squares one in Cancer, cardinal fire against cardinal water. Both signs want to start things, but one charges ahead and the other wants to check everyone is all right first. The shared mode is the reason they collide so directly, since they are trying to act in the same way at the same time.
How close does a square need to be?
Hali counts a square when two planets are within 7° of the exact 90°, widened to 9° when the Sun or Moon is one of them, because the lights are traditionally given more room.
Tighter squares count for more. Your Hali reading shows the exact orb next to each one, like “Moon square Saturn · 2.1°”, so you can tell a loud square from a faint one.
How common are squares?
Squares are among the most common aspects of all, so if your chart has a few, you are in very good company. These figures come straight from Hali’s own calculations.
| Measure | Result |
|---|---|
| Charts with at least one square | 96.2% |
| Average per chart | 3.6 |
| Most common squares | Share of charts |
|---|---|
| UranussquareNeptune | 12% |
| MoonsquareMercury | 10.5% |
| SunsquareMoon | 10.2% |
| SunsquareNeptune | 10.2% |
| MoonsquareVenus | 10.2% |
| MoonsquarePluto | 10.2% |
From Hali's own calculation of 40,000 random charts between 1950 and 2049, using the ten planets and Hali's orbs.
Squares between the slow outer planets last for years and are shared by everyone born in that stretch. The ones involving your Sun, Moon, Mercury, Venus and Mars are personal, and those are the ones worth getting to know.
What is the difference between applying and separating squares?
An applying square is one where the faster planet is still moving toward the exact 90°. A separating square is one where it has already passed it.
Many astrologers read an applying square as pressure still building, and a separating one as a tension you’ve already begun to work through. Hali’s engine tracks which is which for every aspect in your chart.
What did traditional astrologers say about the square?
Ptolemy listed the square among his five aspects and described it, with the opposition, as disharmonious, because it joins signs of unlike nature. Later astrologers called these the hard aspects and the trine and sextile soft.
Modern astrologers tend to keep the word hard but drop the dread. Hard here means effortful, the way a hill is hard, and plenty of people go looking for hills on purpose.
What are a T square and a grand cross?
A T square is when two planets oppose each other and a third squares them both, sitting at the point between. That third planet often becomes the busiest part of the chart, the place where the tension gets resolved through action.
A grand cross is four planets each square to the next, making two oppositions that cross. It’s rare, and astrologers usually read it as a great deal of energy with a strong need for direction.
Which squares happen in the sky?
The most familiar is the Moon’s quarter phases. At the first quarter and the last quarter, the Sun and Moon are 90° apart, and you can see it as a half lit Moon. Anyone born near a half Moon has the Sun square the Moon in their chart.
Every square, planet by planet
Each pair has its own page, read in one chart and between two people.
- SunsquareMoon
- SunsquareMars
- SunsquareJupiter
- SunsquareSaturn
- SunsquareUranus
- SunsquareNeptune
- SunsquarePluto
- MoonsquareMercury
- MoonsquareVenus
- MoonsquareMars
- MoonsquareJupiter
- MoonsquareSaturn
- MoonsquareUranus
- MoonsquareNeptune
- MoonsquarePluto
- MercurysquareMars
- MercurysquareJupiter
- MercurysquareSaturn
- MercurysquareUranus
- MercurysquareNeptune
- MercurysquarePluto
- VenussquareMars
- VenussquareJupiter
- VenussquareSaturn
- VenussquareUranus
- VenussquareNeptune
- VenussquarePluto
- MarssquareJupiter
- MarssquareSaturn
- MarssquareUranus
- MarssquareNeptune
- MarssquarePluto
Frequently asked questions
Is a square bad?
No. It’s called a hard aspect because it creates friction, but friction is what gets things moving. Many astrologers would say a chart with no squares at all can find it harder to get going.
What is the orb for a square?
Hali uses 7°, or 9° when the Sun or Moon is involved. Other astrologers use slightly different orbs, which is one reason two apps can list different aspects for the same chart.
What’s the difference between a square and an opposition?
Both are hard aspects. A square is two planets at a right angle, pulling in different directions and pushing you to act. An opposition is two planets facing each other across the chart, asking you to find a balance between them.
Can Mercury or Venus square the Sun?
No. Mercury and Venus never move far enough from the Sun to make a square with it, so you won’t find either pairing in any chart.
Sources and methods
Frequencies computed by Hali from random charts using the ten planets and Hali’s orbs (7° for squares, 9° with the Sun or Moon). The note under the tables gives the sample.
The square as a disharmonious aspect follows Ptolemy, Tetrabiblos, Book I. Lunar phases from computed planetary positions. Our data is free to use under CC BY 4.0.