Quincunx

The quincunx and the semi-sextile are in most modern aspect tables. In the Greek astrology those tables descend from, they were the definition of not being in aspect.

Hellenistic astrology built its figures out of the signs. Two signs are in aspect when they share something: the trine joins signs of one element, the square joins signs of one mode, the sextile and opposition each join signs of one polarity. Every one of these relations connects signs that have a term in common, and the metaphor throughout is sight, signs in aspect behold one another. The signs thirty and a hundred and fifty degrees away share nothing at all. They are in aversion, and the technical claim is not that the connection is weak but that there is no line of sight. A planet cannot see, and therefore cannot act on, what it is averse to.

That was not a marginal position. It is in Ptolemy's account of the configurations, it runs through Valens, and it survives into the medieval material. The word inconjunct, still attached to the quincunx today, is a fossil of it: the aspect is named for being unjoined.

The reversal happened in the twentieth century, when astrology moved from sign-based to degree-based aspect measurement. Once you are measuring degrees, a hundred and fifty degrees is simply a number like any other, and there is no structural reason to exclude it. The quincunx acquired a delineation, irritation, mismatch, adjustment, and a long-standing though unevidenced association with health, and the semi-sextile acquired a fainter one.

Where this leaves a reading. An astrologer trained in the modern mainstream will find quincunxes in a chart and interpret them. An astrologer working from the Greek sources will look at the same two planets and say they cannot see each other, which is a different statement about the same geometry, and will sometimes read that blindness as significant in its own right. There is no way to split the difference: either the configuration is an aspect or it is the absence of one. The site records both because both are held.

A hundred and fifty degrees separates two signs that share nothing. They are of different modality, different element and different polarity, and in the sign-based doctrine of Hellenistic astrology two such signs are not in aspect at all. They are said to be in aversion, meaning they cannot see one another. The quincunx is therefore not a weak aspect in traditional practice; it is the formal name for the absence of an aspect, and the tradition is explicit that nothing passes across it.

Modern practice inverted this. Having moved to degree-based measurement, where any angular distance can be assigned a meaning, twentieth century writers gave a hundred and fifty degrees a reading of its own: adjustment, chronic low-grade strain, a relation between two things that cannot be resolved and must instead be continually managed. The name inconjunct survives from the older usage and now sits awkwardly beside a body of interpretation that treats it very much as a conjunct thing.

Both positions are live and they are not reconcilable, because they disagree about whether the configuration exists. A practitioner working from Hellenistic principles will pass over a quincunx without comment; one working from a modern text may treat it as among the most diagnostic angles in a chart. Orbs given to it are correspondingly narrow, usually two or three degrees, which is itself an admission that the aspect is being asserted rather than inherited. Anyone reading a chart that turns on a quincunx should know which of these two traditions the reading is standing in.

The one-hundred-and-fifty-degree relation is discussed in Hellenistic sources as an aversion, a non-aspect, and its promotion to an active minor aspect belongs to the broader harmonic current that followed Johannes Kepler's Harmonices Mundi of 1619, though Kepler's own new aspects are usually reckoned as the fivefold and eightfold divisions, the quintile family and the semi-square family, rather than the quincunx specifically, so later astrologers, rather than Kepler himself, are the more exact source for its adoption.

Chart software and modern textbooks nonetheless group it with his reform for convenience. Its glyph, unlike several of the other minor aspects, was given a dedicated place in the Unicode Standard: QUINCUNX at U+26BB in the Miscellaneous Symbols block, drawn as the intersecting lines taken from the inner angles of the lower half of a hexagon, in effect the sextile sign turned and halved, a construction that visually ties the quincunx back to the sextile geometry even though the two aspects have almost nothing else in common. Its codepoint sits in the character table close to the sesqui-quadrate and just after the semi-sextile, a run of minor-aspect signs added to the Miscellaneous Symbols block well after the core set of planetary and classical aspect glyphs that had been present since the standard's earliest releases in the 1990s.