Free Partile Aspects Calculator

A partile aspect is an aspect that is exact within the same degree. Modern astrologers define partile as within 1° of exactness. Traditional astrologers, following William Lilly, define it as both planets occupying the same numbered degree of their respective signs. Either way, the term names the strongest, most active form of any aspect a chart can carry.

This calculator pulls every aspect in your natal chart and filters down to the partile set so you can read the contacts that are actually doing the work.

Most articles conflate these. They are not the same thing.

Partile is exact in degree. Mercury at 9° Aries trine Jupiter at 9° Leo. The aspect is doing real work in the chart and you can feel it from across the room.

Platic is within the combined orb but not exact. Mercury at 9° Aries trine Jupiter at 14° Leo, with each planet contributing roughly 4° of orb, sits in platic range. Functional. Loose.

Separating is what comes after exactness. The faster planet has already passed the aspect's mathematical peak and is moving away. Same orb as an applying aspect of equal tightness, but the energy reads differently. Past tense rather than present tense.

A tight applying square within 1° is partile. A tight separating square within 1° is also partile by the modern definition, even though some traditional sources reserve "partile" only for applying contacts. The applying vs separating aspects calculator handles that motion-phase distinction directly; this tool focuses on tightness.

Lilly's rule, from Christian Astrology (1647): same numbered degree of sign, regardless of minutes.

Mercury at 9°01' Aries and Jupiter at 9°59' Leo? Partile trine. Both planets sit in the 9th degree of their signs. Mercury at 9°01' Aries and Jupiter at 10°00' Leo? Platic. Different degree numbers, even though the actual angular distance between them is smaller than the first pair.

Modern astrology mostly skips this and goes by arc-distance instead: anything within 1° of mathematical exactness counts as partile. By the modern rule, Mercury 9°01' Aries with Jupiter 10°00' Leo is more partile than Mercury 9°01' Aries with Jupiter 9°59' Leo, because the first pair is closer to a true 120° angle.

Both rules have a logic. Lilly respects the symbolic unit of the sign-degree: "the 9th degree of Leo" was a meaningful container in his cosmology. Modern usage respects the geometry: 120° is the actual aspect, not "ninth degree to ninth degree."

This calculator defaults to the modern 1° threshold. A toggle exposes the same-degree-of-sign mode for traditional work, plus Lilly's looser 3° band as a third option. Both flags appear on every result row, so if you want to hold all three definitions at once, you can.

Read tightest first, by arc-minute. A partile aspect at 0°04' separation is a different beast from one at 0°54', even though both qualify. The closer to true exactness, the louder the aspect speaks.

Then sort by who is involved.

Personal planet to personal planet at partile range is a structural feature of your psyche. Sun, Moon, Mercury, Venus, or Mars meeting another personal body at exact degree puts that aspect underneath everything you do. It is not a phase. It is the wiring.

Personal planet to outer planet at partile is a generational marker that lands personally. Many people in your cohort share the same outer-planet positions. Far fewer have a personal planet exact with one of them. When you do, that outer-planet signature gets a private channel into your life.

Outer planet to outer planet at partile is generational signature. Real, but shared with everyone born within a few months of you. Read it as the weather of your time.

If you have zero partile aspects, that is a reading too. Most charts carry between zero and three. A chart with no exact contacts tends to feel less stamped, less locked in. The aspects are still doing things; they are just doing them with more give.

A partile aspect can run across a sign boundary. Sun at 29°30' Pisces conjunct Mercury at 0°15' Aries is partile by the modern definition, with an orb of only 45 arc-minutes, even though the planets sit in different signs and different elements. Lilly's same-degree rule would not classify this as partile, since the degree numbers (29 and 0) differ.

The calculator flags these contacts so you can decide which tradition to honor. A tight cross-sign conjunction often reads as an even more loaded aspect than a same-sign one because the two planets carry different elemental textures into the fusion.

These short reads calibrate the table above. They are not interpretations of your aspects (the calculator handles that per row); they are a reminder of the shape.

The tool pulls the full aspect set from your chart and filters to within 1° of orb. The same astro-service that computes your natal chart computes the partile flag here, so the tightness reading you see in this tool matches the tightness reading any other surface on Augurine would give you.

A toggle switches to traditional mode (same numbered degree of sign, regardless of arc-minutes), and a third option exposes Lilly's redefined 3° band. Major and minor aspect families are both available; the default view shows majors only.

The hero metric counts your partile aspects under the active rule. The result table sorts by orb in arc-minutes, ascending, so the absolute tightest contact is always at the top. Each row carries the planet pair, aspect type, exact orb, applying or separating status, and flags for both partile rules and cross-sign contacts.

Pair this with the applying vs separating aspects calculator to layer motion phase on top of tightness. An aspect that is both partile and applying is the strongest possible reading any single aspect can carry.

One scope note. Aspects to chart angles (Ascendant, Midheaven, IC, Descendant) are not classified here, because angles do not have a longitudinal speed and the applying/separating reading underneath this tool needs one. A partile Sun on the Ascendant still shows up in your birth chart; it just won't appear as a row in this calculator.