The Three Modalities

The twelve signs also divide into three modalities — cardinal, fixed, and mutable — four signs each. Where the element says what a sign is made of, the modality says how it moves: whether it starts things, sustains them, or changes them.

• Cardinal (Aries, Cancer, Libra, Capricorn) — initiates. Begins, launches, takes the first step.
• Fixed (Taurus, Leo, Scorpio, Aquarius) — sustains. Holds, endures, refuses to move.
• Mutable (Gemini, Virgo, Sagittarius, Pisces) — adapts. Adjusts, disperses, changes form.

Every sign is one element and one modality, and the two together define it. Cardinal fire is Aries. Fixed fire is Leo. Mutable fire is Sagittarius. There is exactly one of each combination — twelve in total. That is the entire logic of the zodiac.

The modalities (or quadruplicities) map onto the seasons, which is where their meaning comes from. The cardinal signs begin at the equinoxes and solstices — Aries at the spring equinox, Cancer at the summer solstice, Libra at the autumn equinox, Capricorn at the winter solstice. They are the moments the season turns.

The fixed signs sit in the middle of each season, when it is most fully itself: high summer, deep winter. They hold.

The mutable signs come at the season's end, when it is already dissolving into the next one. They are transitional by nature — which is why they adapt easily and commit with difficulty.

Signs of the same modality sit 90° or 180° apart, which is why they form squares and oppositions — the tense aspects. Two planets in the same modality are trying to move in the same way at cross purposes, which is precisely what tension is.

Count your modalities. Tally which modality each planet occupies.

Strong cardinal: a person who starts. Lots of initiative, many beginnings, sometimes little follow-through.

Strong fixed: a person who holds. Enormous staying power, loyalty, endurance — and real difficulty changing course once committed. Fixed charts do not turn easily, and they know it.

Strong mutable: a person who adapts. Flexible, responsive, good at meeting whatever comes — and prone to scattering, and to changing shape so readily that a stable position is hard to hold.

A missing modality matters too. Little cardinal: trouble initiating. Little fixed: trouble sustaining. Little mutable: trouble adapting.

Tally your ten planets by modality.

Then ask honestly: am I better at starting, at holding, or at adjusting? And which of the three do I avoid?

The most useful pairing is modality with element. "Heavy fixed water" (Scorpio) is a very different creature from "heavy fixed fire" (Leo), though both are equally immovable. Read the two together and the chart's basic mechanics come into focus before you have looked at a single house or aspect.

A T-square — the classic modal signature — is two planets in opposition, both squared by a third. All three are usually in the same modality, and the third planet is the apex: the point where the tension concentrates and has to be discharged.

A cardinal T-square produces a crisis of action: the person must do something, and the apex is where the doing gets stuck. A fixed T-square produces a crisis of holding: enormous force meeting enormous resistance, and an apex that will not yield. A mutable T-square produces a crisis of scattering: too many directions at once, and an apex that must learn to choose.

The apex planet is the most important point in any T-square, and this school treats it as one of the most important structures in a chart — especially when it squares the nodal axis. See The North Node for that case.

• Sue Tompkins, The Contemporary Astrologer's Handbook — modalities and aspect patterns, clearly taught.
• Stephen Arroyo, Astrology, Psychology and the Four Elements — modality alongside element, as they should be read.