Aspects: How Planets Talk to Each Other

If the planets in a birth chart represent different parts of your life and personality, aspects show how those parts interact with one another.

An aspect is the angle, measured in degrees, between two planets on the chart wheel. You can think of it as a kind of conversation between planets: sometimes they cooperate easily, sometimes they create tension, and sometimes they simply bring two different parts of life into focus at the same time.

For example, imagine that one planet represents communication while another represents emotions. The aspect between them can give us clues about how a person's thoughts and feelings may work together, or sometimes clash.

Why do certain angles matter?

A birth chart is a complete circle of 360°. Certain angles appear repeatedly in astrology because they divide that circle into simple, recognisable patterns, such as halves, thirds, quarters, and sixths.

These relationships are traditionally given names such as conjunction, opposition, trine, square, and sextile. Each describes a different kind of relationship between the planets.

The important thing for a beginner is not to memorise all the numbers immediately. Instead, remember this:

Planets tell us what is happening; aspects tell us how those planetary energies relate to each other.

This is why aspects are such an important part of reading a birth chart. They can show where different parts of your personality naturally support one another, where there may be inner tension or challenges, and where certain qualities can become particularly noticeable.

Once you understand aspects, a birth chart stops looking like a collection of unrelated planets and begins to look more like a connected system, with different parts constantly interacting.

The major aspects

There's also the quincunx (150°), a minor-but-common aspect between planets that share almost nothing in common (different element, different modality) — read as an awkward, adjustment-requiring relationship rather than clean harmony or clean tension.

What "orb" means

Two planets are rarely at an exact angle down to the degree. Orb is the allowed margin of error — a Sun/Moon conjunction with an orb of 3° means the two are within 3° of exactly 0° apart, and still counted as conjunct. Tighter orbs (closer to exact) are read as stronger; wider orbs are read as present but more subtle. Different aspects conventionally get different maximum orbs — a conjunction or opposition is usually allowed a wider orb than a quincunx, for example.

Applying vs. separating

An aspect is applying when the two planets are moving toward exactness, and separating once they've passed it and are drifting apart. Applying aspects are traditionally read as still building, with their effects ahead; separating aspects as already integrated, with their effects behind. This app calculates applying/separating from each planet's actual motion, not just its retrograde status — since two planets moving the same direction at different speeds can still be applying or separating depending on which one is "catching up."

Why aspects matter more than isolated placements

A chart read purely planet-by-planet, sign-by-sign, house-by-house misses how those pieces interact. Aspects are where the real story of a chart lives — they show which parts of a personality reinforce each other and which pull in different directions, which is why a full report spends as much time on aspects as on individual placements.

Once you know which two planets are involved in one of your own aspects, look up each one's fuller meaning in the glossary to read what's actually meeting what in your chart.