Astrology Glossary: every term explained in plain English

What are astrology terms, and why do they matter?

Astrology terms are the labels astrologers use for specific, measurable things: a point on the horizon, a body in orbit, an angle between two planets, a slice of a sign. None of them is mystical on its own. "Midheaven" is where the ecliptic crossed the meridian at the minute you were born. "Retrograde" is what a planet looks like from Earth when we overtake it. "Stellium" is three or more planets standing close together. The meaning comes later, when you read those facts as a language.

That is why vocabulary matters more in astrology than in most hobbies. If you do not know what a dispositor is, the sentence "your Venus is disposed by a retrograde Saturn in the 4th" is noise. Once you do, it is a fairly precise description of someone who loves slowly, privately and for keeps. The same is true on the dating side: "our Moons square" or "your Mars sits on my Descendant" are compact ways of describing dynamics that would otherwise take a paragraph and a therapist.

Every definition below follows the same rules. First, a description that is astronomically true (we use the tropical zodiac, Placidus houses and Swiss Ephemeris-grade positions, the same engine that draws your birth chart). Second, the interpretive meaning, framed as a lens rather than a verdict. Third, where it shows up in a relationship, because that is what most of our readers came for. If a term has its own page, the card links to it. If it does not yet, it is in the reference table further down with a one-line definition.

How to use this glossary

If you are new: start with the Big Three, which are the Sun, Moon and Ascendant. Those three terms unlock most horoscope writing. Then add the four angles (Ascendant, Descendant, Midheaven, Imum Coeli), which need your birth time, and the North Node. With those seven words you can follow almost any chart reading.

If you already have your chart open: scan the A–Z cards for the terms your reading mentions. Charts produced by AstraLink name the chart ruler, the nodes, the dispositor centre, the strongest aspects and any patterns such as a stellium or yod, so those pages are the natural next click. If you do not have a chart yet, the free birth chart calculator takes about a minute and needs your date, time and place of birth.

If you are reading for timing: the words you need are transit, retrograde and cazimi. They describe what the sky is doing now and how it touches your chart, which is the whole logic behind the cosmic calendar and the app's Cosmic Simulator.

If you are reading for love: every term page has a short synastry section, and the compatibility hub shows the terms in action across sign pairings. The synastry guide explains how two charts are overlaid in the first place.

The vocabulary, in layers

Astrology terms fall into six families. Knowing which family a word belongs to tells you what kind of information it carries.

Points and angles

Points are not objects; they are places on the chart wheel defined by geometry. The Ascendant and Descendant come from the horizon, the Midheaven and IC from the meridian, and the lunar nodes from where the Moon's path crosses the Sun's. Because the horizon and meridian move through the entire zodiac every 24 hours, angles are the most time-sensitive part of a chart. A birth time that is off by 20 minutes can shift the Ascendant by a full sign near the boundaries, which is why the rising sign guide spends so long on birth certificates. Points describe where life happens: identity, partnership, career, home.

Bodies

Bodies are the things that actually orbit: the Sun and Moon (called luminaries), the eight planets, plus smaller objects astrologers have adopted because they add detail. Chiron is a centaur between Saturn and Uranus. Black Moon Lilith is, strictly, not a body at all but the far point of the Moon's orbit, which is why it belongs to two families at once. Bodies describe what is acting: drive (Mars), attraction (Venus), thought (Mercury), structure (Saturn). Each planet has a hub in the learning centre, starting with Venus.

Aspects and patterns

An aspect is the angle between two bodies measured along the zodiac: 0° conjunction, 60° sextile, 90° square, 120° trine, 180° opposition, and the awkward 150° quincunx. Patterns are aspects that lock into shapes: the T-square, the grand trine, the yod, the stellium. Aspects describe how parts of you (or two of you) get along.

Timing

Timing terms describe motion. A transit is a planet's current position touching your natal chart. A retrograde is an apparent reversal. A cazimi is a planet sitting in the exact heart of the Sun. A void-of-course Moon is the stretch after the Moon's last major aspect in a sign. These terms power every horoscope, every "should I sign today?" question and the AI Advisor inside the app.

Signs and their subdivisions

Signs are the twelve 30° segments of the ecliptic, grouped by element (fire, earth, air, water) and by modality (cardinal, fixed, mutable). Each sign is cut again into three decans of 10°, which is why two Scorpios born three weeks apart can feel like different people.

Systems and rulerships

Finally there is the machinery: house systems (Placidus, whole sign, Koch), rulerships (which planet governs which sign) and the dispositor chains that follow those rulerships to a single planet in charge. These are the terms that make astrologers argue, and they are worth knowing precisely because different systems produce different charts.

Terms you will hear on a date

Astrology has crossed from hobby to social shorthand in the United States: Pew Research found 27% of US adults believe in astrology, and the figure rises to 43% among women aged 18 to 49. That means "what's your rising?" is now a real question on real dates. The terms that come up most, in our experience, are the Big Three, Venus and Mars signs, the Moon sign, the 7th house and the North Node. If someone says your charts are "a Saturn match", they mean the long-haul, slightly serious kind of connection, and the Saturn return guide explains why that planet carries the reputation it does.

A word of caution that applies to the whole glossary: no single term decides anything. A Venus-Pluto square is not a breakup; a Sun-Moon trine is not a wedding. Terms are vocabulary for describing a pattern so you can decide what to do with it. That is the philosophy behind chart-based matching in AstraLink, and it is why every score in the app explains itself in exactly these words.

A note on systems and sources

Two astrologers can look at the same birth data and produce slightly different charts, because they may use different house systems, different rulership sets (traditional or modern) or different zodiacs. When a term on this site depends on such a choice, the page says so. Our defaults are the tropical zodiac, Placidus houses and the modern rulers with the traditional ruler noted alongside, so that a reader coming from a Vedic or whole-sign background can translate.

Where to go next

The learning centre organises the same vocabulary by chart component (planets, houses, aspects, patterns), while the Academy turns it into a 55-lesson course personalised to your own placements. If you want the definitions in action, the seven-step guide to reading your birth chart walks through a real chart using every term family above. And if you would rather have the reading done for you, early access includes a full AI natal chart that names your chart ruler, nodes, dispositor centre, strongest aspects and patterns.