Square aspect in astrology

By Ines Vasquez

A square is two planets roughly 90 degrees apart in the zodiac. Traditional astrology classifies it as a hard or malefic aspect, meaning friction, obstruction and effort. Modern astrology keeps the friction but reads it as productive: the place in a chart where two drives collide and something has to be built to hold them both.

What does a square mean in astrology?

Ninety degrees of separation between two planets, give or take an orb of several degrees. The two planets are usually in signs of the same modality — both cardinal, both fixed, or both mutable — but of incompatible element, which is the structural reason the tradition treats the angle as difficult. Aries and Cancer are both cardinal: both want to initiate, and they want to initiate in directions that have nothing in common.

Ptolemy, writing the Tetrabiblos in the second century, grouped the square with the opposition as the aspects of discord, against the trine and sextile as the aspects of agreement. That classification held with very little argument for something like eighteen centuries. What changed in the twentieth century was not the description of how a square feels but the judgement about whether feeling that way is a misfortune.

Astrologers read a square as tension that will not resolve itself by being ignored. The two planets are in a relationship they cannot escape and cannot easily negotiate. Where a trine — 120 degrees, two planets in the same element — is held to flow without the person noticing it, a square is held to be the part of a chart a person is aware of, usually early, usually repeatedly.

Why is 90 degrees a difficult angle?

Because of what it does to the sign relationship. The zodiac's twelve signs are grouped two ways: by element (fire, earth, air, water) and by modality or quadruplicity (cardinal, fixed, mutable). Signs 90 degrees apart share modality and differ in element. Signs 120 degrees apart share element and differ in modality.

Shared modality means shared method. Two cardinal planets both want to start things. Two fixed planets both want to hold position. Two mutable planets both want to adapt and revise. Incompatible element means the goals differ fundamentally — fire and water, earth and air. So a square puts two planets in the position of using the same tactics for opposite ends, which is closer to a collision than to a disagreement.

An opposition, by contrast, joins signs of compatible element. Aries and Libra are fire and air. The tension in an opposition is read as a see-saw between two positions that can at least see each other. A square is read as a blind spot, because the planets are not facing one another at all.

What is the difference between a square and an opposition?

Both are hard aspects, and the classical tradition treats them as the two aspects of discord. The distinction most modern astrologers draw is between projection and obstruction.

An opposition tends to be described as something a person meets in other people: 180 degrees puts the two planets across the chart from each other, and the standard reading is that one end gets lived out and the other end gets found in a partner, a rival, a boss. Squares are described as internal. The friction is between two of the person's own drives, and because the planets are 90 degrees apart they have no line of sight, so the tradition holds that squares are harder to see in oneself than oppositions are.

That said, the projection reading of the opposition is twentieth-century psychological astrology, not classical doctrine. Dane Rudhyar, whose The Astrology of Personality (1936) did more than any other book to reframe aspects as stages in a cycle rather than verdicts, is a useful marker for when this vocabulary entered the practice. Ptolemy has no theory of projection.

Is the square really the most productive aspect in a chart?

Many modern astrologers argue so, and the argument is worth stating properly rather than repeating as a slogan.

It runs like this. An aspect only produces something when it requires work. A trine describes a facility so native to the person that it may never be developed, because nothing ever forces the issue — the twentieth-century literature is full of warnings about easy aspects going to waste. A square cannot be ignored. Two planets in conflict keep generating the same problem until the person builds something capable of holding both. What gets built is competence, and competence built under pressure tends to be the part of a chart that shows up in a biography.

The counter-argument, and traditional astrologers do make it, is that this reasoning quietly converts difficulty into virtue by definition, which makes it unfalsifiable. Hellenistic and medieval astrology had no interest in squares as growth. Squares were bad; the question was how bad, which planets were involved, and whether the rest of the chart mitigated it. Abu Ma'shar in the ninth century and William Lilly in Christian Astrology (1647) both work with a square as straightforward impediment, and the revival of traditional technique since the 1990s has brought that reading back into circulation.

Neither camp is careless. The honest position is that the modern reading is a reinterpretation, not a discovery, and that it serves a different purpose: classical astrology was often answering a specific question about an outcome, and modern natal astrology is usually trying to describe a life from inside.

What does a square look like when it repeats?

Recurrence is the reason squares get noticed. The same situation presents itself, with different people in it, at intervals — and what astrologers point to is that the underlying configuration has not changed, so the situation has no reason to.

A natal square between, say, Mars and Saturn is read as a permanent argument between the impulse to act and the impulse to be sure first. It does not get resolved at thirty and stay resolved. What the tradition claims changes is the person's relationship to it: the same tension, handled with more skill, produces something different at forty than at twenty-two.

Transiting squares — where a planet in the sky reaches 90 degrees from a natal planet — are read as the moments the argument gets loud again. Because the outer planets move slowly, a transiting square from Saturn, Uranus, Neptune or Pluto can sit within orb for the better part of a year and pass over the same degree three times if the transiting planet stations retrograde. Astrologers treat those three passes as one episode in three acts rather than three separate events. Whether an aspect is applying, moving towards exactitude, or separating, moving away from it, changes how it is read, and that distinction matters more for squares than for any other aspect.

The Moon squares every natal planet twice a month, once waxing and once waning, briefly, which is why square transits from the Moon are read as passing weather and square transits from Saturn are not.

What counts as a square — how exact does it have to be?

Not exact. Astrologers allow an orb, a margin of degrees either side of the perfect angle within which the aspect is still held to operate.

Those figures are conventional rather than fixed, and practitioners differ. Traditional astrology did not assign orbs to aspects at all; it assigned them to planets. Each planet had its own orb, and two planets aspected each other when they came within half the sum of their two orbs — that half is what the older texts call a moiety. Lilly's table gives the Sun 17 degrees and Saturn 10, so a Sun–Saturn square was allowed 13 degrees and 30 minutes, wider than most modern astrologers use.

A square within a degree of exact is described as a tight or partile square, and the tradition across all periods agrees that the closer the angle, the stronger the effect.

Which squares are considered hardest?

There is no ranking the tradition agrees on, but the reasoning is consistent: the difficulty of a square is taken from the planets in it, not from the angle.

Squares involving Saturn are read as structural — limitation, delay, the requirement to earn something. Squares involving Mars are read as friction with a temper in it. Squares to the outer planets, discovered in 1781, 1846 and 1930 respectively and therefore having no classical doctrine at all, are read through their modern significations: Uranus as disruption, Neptune as dissolved boundaries, Pluto as compulsion.

A square between two benefics — Venus and Jupiter in the classical scheme — is still a square, and traditional astrology held that even benefic planets in hard aspect produce the difficulty characteristic of the aspect, though with a gentler quality. The angle sets the relationship; the planets set what the argument is about.

More in The aspects

• What is an aspect in astrology?
• What does a conjunction mean in astrology?
• What does an opposition mean in astrology?
• What does a trine mean in astrology?
• What does a sextile mean in astrology?
• What is an orb in astrology?
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