Comets in mundane astrology: what the sources claim and how to test it

Comets occupy an odd place in the tradition. They are outside the ordered system — they belong to no sign permanently, rule nothing, and were long held to be sublunary. And yet the mundane authors treat them with great seriousness and make unusually specific claims about them.

That specificity is what makes them worth studying. Most mundane predictions are vague enough to survive any outcome. Comet doctrine is not.

The three judgements

A comet is judged on three counts, and each produces a testable statement.

Its nature

Colour, speed, form of tail and position relative to the Sun are used to assign a comet a planetary nature — most often a combination of two. A comet of the nature of Mercury and Mars is read quite differently from one of the nature of Saturn: the first for quarrels, treachery, sudden violence and words used as weapons; the second for scarcity, cold and slow ruin.

Its place in the zodiac

The sign in which a comet first appears governs the matters affected. A comet in Scorpio is given by the sources to war and rebellion, harm to soldiers, contention among great men, and the death of eminent persons. The recurring theme across the authorities is the same: comets signify the fall of rulers, not the fortunes of ordinary people.

A comet that passes across a royal fixed star, or that stands near one on the day of an event, is treated as a strong confirmation.

Its declination

This is the part most often left out, and it is the part that makes the doctrine falsifiable. The range of declination a comet covers is mapped onto terrestrial latitudes, and the region whose latitudes correspond is where the effects are expected. Combined with the sign's traditional geography — in Ptolemy's scheme, which is what these authors are using — this produces a prediction naming a part of the world.

A comet ranging between roughly fifteen degrees south and eighteen degrees north points to the equatorial and tropical belt; a comet first seen in Scorpio points, in Ptolemy's allocation, to parts of north and west Africa. That is a claim one can be wrong about.

Timing

A comet oriental of the Sun is held to act quickly, an occidental one slowly. This matters for how any prediction is framed: a comet judged oriental commits the astrologer to effects within weeks, which is again a claim that can fail.

Bringing it down to an event

A comet describes a climate, not an incident. The incident, if there is one, is shown by an ordinary event chart, and the comet's contribution is visible in the agreement between the two.

The usual chain in a violent political event runs: a human sign rising; the lord of the eighth on the Ascendant or afflicting its lord; that lord conjunct Mars, which the tradition reads as death by human hands rather than by accident; and the derived houses identifying whose death — the eighth from the tenth for a head of state, the eighth from the tenth from the tenth for a commander.

When the planetary pair that dominates such a chart is the same pair assigned to the comet by its nature, and the exact aspect between them falls within hours of the event, the mundane judgement and the event chart are saying the same thing in two languages. That agreement is the evidence. Either one alone is not.

The honest caveat

All of this is retrospective. Comet doctrine is worth studying because its claims are unusually precise, and precise claims can be checked against a record — but checking a claim after the event is not the same as making it before.

The serious test would be a prediction registered before the period it covers, with its region and its timeframe stated. That is uncomfortable, which is why it is rarely done, and it is the only thing that would settle the matter.

Mundane technique, including comets, eclipses and the great conjunctions, is treated in the Tradition.