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Astrology Aspects: How the Planets Talk to Each Other
A planet on its own says little about a chart. Meaning appears in the angles planets make to one another, measured in degrees around the circle. A trine behaves nothing like a square even when the same two planets are involved, so aspect work sits near the centre of chart reading.
What an Aspect Is
An aspect is the angular distance between two planets, measured in zodiacal longitude. When that distance lands near a familiar number such as 60, 90, 120 or 180 degrees, the two planets are treated as linked. The link carries meaning: the two functions described by the planets have to work together.
Aspects are read from the chart wheel, where planets appear spread around a circle. Two planets close together share a sign and merge their meanings; two planets opposite each other sit in tension across the wheel. Distance is the whole point.
The Five Major Aspects
Tradition names a handful of aspects as major, and they do most of the work in a reading.
- Conjunction — Zero degrees. The planets merge and act as one, for better or worse.
- Sextile — Sixty degrees. An easy, optional link that rewards initiative.
- Square — Ninety degrees. Friction that forces movement and builds strength.
- Trine — One hundred and twenty degrees. Natural flow, comfort, sometimes complacency.
- Opposition — One hundred and eighty degrees. A pull between two poles looking for balance.
Orbs: How Close Counts
An orb is the tolerance allowed around an exact aspect. A square of 87 degrees still counts as a square if the orb for that aspect and those planets is wide enough. Tighter aspects are felt more strongly and speak more loudly in a reading.
It helps to resist treating any aspect as a verdict. A Mercury square Saturn can describe careful, slow thinking that produces precise work, or harsh self criticism, and the houses involved usually show which. The same square on different planets, or in a different house, reads like a different sentence.
Orb sizes vary by practitioner and by planet. Many astrologers allow eight to ten degrees for the Sun and Moon and less for the outer planets, and most give conjunctions and oppositions the widest orbs of all. A contact within a degree of exact is treated as exact, whatever the system, and often dominates a chart.
Applying and Separating
An aspect is applying when the faster planet is still moving toward an exact contact, and separating when it has already passed. Applying aspects tend to describe matters still building, and separating aspects describe conditions already in motion. The distinction sharpens timing questions.
Because the Moon moves about thirteen degrees a day, it forms and breaks aspects constantly. Watching the Moon pass over the planets of a chart is one of the clearest ways to see aspects behave in real time.
Minor Aspects and Patterns
Beyond the majors sit the minor aspects, including the semisextile at thirty degrees, the quincunx at a hundred and fifty, and the semisquare at forty five. They add detail and are usually read only when tight and when the major aspects leave a gap.
Aspect patterns matter more than any single contact. A grand trine gathers three planets in one element and shows where a chart has natural ease. A T-square puts two planets in opposition with both square a third, describing a build up of pressure with a clear release point. A yod, formed by two quincunxes and a sextile, tends to be read as an unfinished adjustment that keeps returning.