Layer 4 — Aspects

Two planets can occupy different signs and still form a recognisable pattern. The next step is to compare their positions: how far apart are they around the circle, and is that separation growing or shrinking?

Aspect

An aspect is a specified angular relationship between chart points. The word comes from the idea of looking or regarding; traditional astrology speaks of planets “seeing” one another. The measured angle supplies the geometry, and a tradition supplies its interpretation.

For longitude aspects, use the shorter arc between two positions. A planet at 350° and one at 10° are only 20° apart across zero. With longitudes already wrapped into 0°–360°, the arithmetic is:

d = abs(first longitude − second longitude)
separation = min(d, 360° − d)

Not every separation has a name. An aspect profile selects which angles to recognise and how close a pair must come before the relation counts.

Major aspects

The five familiar major aspects become easier to remember when you draw them. A conjunction joins two points at 0°; an opposition faces them across the circle at 180°. A sextile is a sixth of 360°, a square a quarter turn, and a trine a third. Three equally spaced points therefore form a triangle with trine separations.

The qualities are common astrological interpretations. The orb ranges are examples of settings. Neither is an extra physical property of a 60° or 120° angle.

Minor aspects

The names of many minor aspects reveal their arithmetic. Semi- means half: half a sextile gives 30°, and half a square gives 45°. Sesqui- means one and a half, so a sesquiquadrate is 1.5 × 90°, or 135°.

A quintile divides the circle by five, giving 72°; a biquintile doubles that to 144°. Quincunx, also called inconjunct, names the 150° relation. Its name originally referred to a five-point arrangement rather than a simple fraction of a circle.

“Minor” identifies the group outside the five major aspects. Which of them a reader uses, and what importance they receive, depends on the school and chosen profile.

Orb

Real charts rarely place every pair at an exact named angle. An orb gives the permitted neighbourhood around exactness. The word carries the sense of a surrounding circle or sphere; here it becomes an angular tolerance.

Suppose two bodies are 118° apart. They miss an exact trine by 2°. With a maximum orb of 3°, the trine qualifies; with a maximum orb of 1°, it does not. The geometry is unchanged in both cases. The setting changes the classification.

Keep orb distance and maximum orb separate. The first describes how far this pair is from exactness; the second is the chosen limit for recognising it.

Applying and separating

Now let the positions move. If a 118° separation grows toward 119°, it is approaching the exact 120° trine: the aspect is applying. If it shrinks toward 117°, the distance from exactness grows: it is separating.

The important quantity is relative motion. Retrograde movement can change which body approaches the other, so the faster body’s usual direction is not enough. Compare nearby times or use the two longitude speeds to establish the local trend.

An applying aspect can turn away before becoming exact if a body stations. “Getting closer now” does not guarantee a future exact crossing.

Parallel and contra-parallel

So far we have travelled around the ecliptic. Parallels compare another coordinate: declination, the angular distance north or south of the celestial equator.

Two bodies at +15° declination are parallel. At +15° and −15°, they are contra-parallel, mirrored across the equator; contra means opposite. A declination tolerance determines how close those values must be.

These pairs can have many different longitude separations. Reading a parallel therefore means changing the coordinate being compared, rather than adding one more target angle to the longitude-aspect table.

Aspect patterns

Join several qualifying pairs with lines and a larger shape can appear. An aspect pattern names that arrangement. The geometry makes many of the names memorable without needing a separate mnemonic.

A stellium needs special care: it is a cluster, often defined by a shared sign, house or conjunction group, rather than necessarily a closed aspect figure. Thresholds of three or four planets both occur. The allowed bodies and orbs are part of any pattern’s rule, which explains disagreements between tools.

Drishti (Vedic aspects)

Jyotish also uses the language of sight. Drishti means sight or gaze, but it names several rule families rather than simply translating the Western angle list.

In a common Parashari graha drishti, or planetary-aspect scheme, all seven classical planets aspect the seventh place from themselves. Mars additionally aspects the fourth and eighth, Jupiter the fifth and ninth, and Saturn the third and tenth. Counting is inclusive: from Aries, Aries is first and Libra seventh.

Rashi drishti instead relates signs. Degree-based strengths also exist within Jyotish. Before comparing two drishti results, establish which family each uses.

Node aspects vary between traditions. A rule stated for Rahu and Ketu should identify its school rather than being treated as a universal extension of the seven-planet scheme.

We can now compare positions within a chart. The next step is to decide which times, places or people the chart brings together.

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