Placements tell you what a chart contains. Aspects tell you how the contents interact, which is where reading actually begins.
An aspect is an angle
The definition is simpler than the vocabulary suggests.
Take two planets. Measure the angular distance between them along the zodiac circle. If that distance is close to one of a small set of significant angles, the planets are said to be in aspect.
That is the whole mechanic. Everything else is which angles count, how close is close enough, and what each is read to mean.
Without aspects a chart is ten separate statements. With them it is a system in which the parts talk to each other, and the conversation is what gets read.
Dividing the circle
Where the significant angles come from, and it is more principled than it looks.
The zodiac is a circle of 360 degrees. The major aspects are produced by dividing that circle by small whole numbers.
Divide by 1: 360 degrees, which brings you back to the start. Two planets in the same place is the conjunction, at 0 degrees.
Divide by 2: 180 degrees. The opposition.
Divide by 3: 120 degrees. The trine.
Divide by 4: 90 degrees. The square.
Divide by 6: 60 degrees. The sextile.
Two structural consequences follow, and they explain a great deal.
Aspects correlate with elements and modes. Signs 120 degrees apart share an element, which is why trines are read as easy. Signs 90 degrees apart share a mode but conflict in element, which is why squares are read as friction between things operating in the same way for different purposes.
Division by five and seven is excluded from the majors. Dividing by five gives 72 degrees, the quintile, and these minor aspects exist and are used by some practitioners. The majors are the divisions that produce whole-sign relationships, which is why they carry the weight.
The five major aspects
What each is read as, stated as the tradition gives them.
Conjunction, 0 degrees. Two planets in the same place. Read as fusion: the functions operate together and are difficult to separate. Whether this is comfortable depends entirely on which planets, since a conjunction intensifies rather than judges.
Opposition, 180 degrees. Directly across the chart. Read as tension between two functions pulling opposite ways, and as something usually experienced through other people. The tradition treats it as requiring balance rather than resolution.
Trine, 120 degrees. Same element. Read as easy flow, natural talent, things that work without effort. Its weakness in the tradition is exactly that: what comes easily is often not developed.
Square, 90 degrees. Same mode, conflicting element. Read as friction, obstruction and internal conflict, and also as the aspect that produces effort and therefore development.
Sextile, 60 degrees. Compatible elements, fire with air or earth with water. Read as opportunity that requires taking up, milder than a trine and needing more participation.
How this is taught inside Astra Trainer
This is Aspects, one of thirteen sub-topics in the Astrology direction of the Spiritual world.
It covers the geometry, and Aspects between Planets covers reading specific pairs. Both follow Planets, Zodiac Signs and Houses, since an aspect is a relationship between placements and the placements have to be understood first. Lessons take about five minutes, and there is a discussion thread under every one.
Orbs, and the argument about them
Aspects are almost never exact, and the allowance around exactness is where astrologers disagree openly.
An orb is the permitted deviation. If the trine is 120 degrees and two planets sit 125 degrees apart, that is a trine with a 5-degree orb, provided the practitioner accepts orbs that wide.
The disagreement is substantial and it is not trivial.
Tight orbs, in the region of a few degrees, produce charts with fewer aspects, each carrying more weight. Practitioners who prefer this argue that wide orbs dilute the technique until everything aspects everything.
Wide orbs, up to eight or ten degrees for major aspects involving the Sun and Moon, produce charts with many more connections. Practitioners who prefer this argue that influence fades gradually rather than stopping at a boundary.
Variable orbs are common: wider for the Sun and Moon, narrower for the outer planets, wider for conjunctions and oppositions than for sextiles.
The honest statement is that there is no agreed answer. Two competent astrologers can look at the same chart and disagree about whether a given aspect exists, and both readings will be defensible within their own conventions. Anyone learning this should know that the orb convention is a choice being made, not a fact being reported.
Applying and separating
A distinction from traditional practice that adds real precision, and it is frequently skipped in modern beginner material.
Planets move at different speeds. An aspect between two of them is therefore either closing or opening.
Applying means the faster planet is moving toward exactness. The aspect is tightening.
Separating means exactness has passed and the aspect is loosening.
Traditional practice weights applying aspects considerably more heavily, on the reasoning that an applying aspect is still gathering force while a separating one has already delivered.
The practical use is that two charts with the same aspect at the same orb can be read differently depending on direction, which is a finer distinction than orb width alone.
Hard and soft, and why the labels mislead
The convention, and the correction that goes with it.
Squares and oppositions are grouped as hard aspects. Trines and sextiles as soft. Conjunctions sit outside the grouping, taking their character from the planets involved.
The labels are useful shorthand and they mislead when read as good and bad. Three reasons this matters.
Hard aspects produce development. The tradition's own position is that friction generates effort and effort generates capability. Charts with many hard aspects are read as demanding rather than unfortunate.
Soft aspects can go unused. A trine describes something that comes easily, and what comes easily is frequently never worked on. The tradition treats unexercised talent as a real problem.
The planets matter more than the angle. A square between two benefics and a trine between two difficult placements are not what the labels would predict, and experienced practitioners read the pair before the geometry.
So the useful framing is not comfortable against uncomfortable but effortless against effortful, with both carrying advantages and costs.
Not a basis for decisions. This article describes how astrologers read angular relationships within their own tradition. Astrology is not a source of medical, psychological, financial or legal guidance, and nothing here should inform decisions in those areas. For health concerns see a qualified medical professional, and for financial or legal matters a qualified professional in that field.
What to take from this
An aspect is an angle between two planets, and it is the layer that connects placements into a chart.
The major aspects come from dividing the circle by one, two, three, four and six, which is why they line up with elements and modes.
Orb width is an open disagreement, and the convention chosen determines which aspects appear at all.
Applying aspects are tightening and separating ones are loosening, and traditional practice weights the former.
And hard against soft is not good against bad. It is effortful against effortless, and each has its own failure mode.
What is an aspect in astrology?
An angular relationship between two planets measured along the zodiac. When the distance is close to one of a set of significant angles, the planets are said to be in aspect and are read as interacting.
Where do the aspect angles come from?
Dividing the 360-degree circle by small whole numbers. By two gives the opposition at 180 degrees, by three the trine at 120, by four the square at 90, by six the sextile at 60, with the conjunction at 0.
What is an orb?
The permitted deviation from an exact angle. Astrologers disagree substantially about how wide orbs should be, and the choice determines which aspects appear in a chart at all.
What is the difference between applying and separating?
An applying aspect is still tightening toward exactness; a separating one has passed exactness and is loosening. Traditional practice weights applying aspects more heavily.
Are squares bad and trines good?
Not in the tradition's own terms. Squares generate friction and therefore effort and development; trines describe ease, which frequently goes undeveloped. The framing is effortful against effortless rather than bad against good.
