Draw the twelve signs around a circle, thirty degrees apart, and every pair of signs forms an angle. Astrologers call these angles aspects, and reading them is one of the oldest games in the tradition: some angles are said to flow, others to grind, and the difference is pure geometry — no personality required.
Here is the whole vocabulary, in ascending order of distance.
| Angle | Aspect | Signs apart | Character |
|---|---|---|---|
| 0° | Conjunction | Same sign | Amplification — the mirror |
| 30° | Semi-sextile | 1 | Curious neighbors |
| 60° | Sextile | 2 | Friendly ease, rewards initiative |
| 90° | Square | 3 | Friction and chemistry |
| 120° | Trine | 4 | Native harmony, same element |
| 150° | Quincunx | 5 | Fascinating strangers |
| 180° | Opposition | 6 | Magnetic complements |
Conjunction (0°): the mirror
Same sign, or signs side by side in a chart. In sign-to-sign terms this is the Leo and Leo case: one operating system running on two machines. Everything doubles — the gifts and the blind spots. The old texts call conjunctions powerful and unstable for couples: self-knowledge becomes a survival skill, because your partner's most annoying habit is usually yours in better lighting.
Semi-sextile (30°): the neighbors
Adjacent signs share a border and almost nothing else — each sign is, by design, a reaction to the one before it. Aries and Taurus are a textbook case: the spark and the soil. These couples grow by anthropology — genuine curiosity about how differently the other one solves an ordinary day.
Sextile (60°): the friendly angle
Two signs apart means compatible elements — fire with air, earth with water. Sextiles are the tradition's "good friends who kiss": easy conversation, low-static affection. The one caveat the old books attach: sextiles reward initiative. The ease is an invitation, not a guarantee; somebody still has to make the move.
Square (90°): the grindstone
Three signs apart, same modality, clashing agendas — this is the aspect that gives astrology columns their drama. Aries and Cancer square each other: both are cardinal, both must lead, and they lead in opposite directions.
Squares are also, notoriously, the aspect of chemistry. Nothing about a square is lukewarm, and couples who learn to fight well — with humor, without scorekeeping — often credit the square itself for their durability. The friction that grinds can also polish.
Trine (120°): coming home
Four signs apart, same element: the golden aspect. Trines feel like recognition — Taurus and Virgo rarely need to explain themselves to each other. The tradition's only warning is the gentlest one on this page: what arrives without effort can be taken without gratitude. Trines coast; coasting couples drift.
Quincunx (150°): the fascinating stranger
Five signs apart, sharing neither element nor modality nor polarity — no common ground at all, on paper. Gemini and Scorpio sit at this angle: breadth meets depth. Quincunx couples never stop adjusting to each other, which is either exhausting or the most interesting thing that ever happened to either of them. Frequently both.
Opposition (180°): the other half
Six signs apart — directly across the wheel. Oppositions are the zodiac's great axes: Aries and Libra (self and partnership), Taurus and Scorpio (keeping and transforming). Each sign is the other's missing argument.
Opposites attract is the cliché; the tradition is more precise. Oppositions work exactly as long as "different from me" is read as "completes me" — and combust the moment it starts reading as "wrong."
Geometry is one voice of four in every reading on this site. To see how a pair's aspect interacts with its elements, temperaments and numerology, open any compatibility page — each lens keeps its own score, and its own footnote.