The whole chart comes down to two planets
A horary chart holds ten bodies, twelve houses and dozens of aspects. Yet the answer is read, almost always, by looking at what just two planets are doing to each other. Those two are the significators.
The logic is this: a question always has two sides. One is the person asking, the other is the thing asked about. In “will I get the job?” the sides are you and that job. In “will they come back?” they are you and that person. The chart binds each side to a planet, then asks whether those two planets are approaching each other.
The first significator: the querent
The person asking is always the 1st house of the chart. The sign on the 1st cusp is the Ascendant, and the ruler of that sign is the querent's significator.
So the only thing to do is find the rising sign and look up its ruler. Libra rising, the significator is Venus. Aries rising, it is Mars.
The classical table of rulerships
Horary uses the traditional seven planets; Uranus, Neptune and Pluto rule no sign. Which means every planet but the Sun and Moon looks after two signs:
- Aries and Scorpio
- Mars
- Taurus and Libra
- Venus
- Gemini and Virgo
- Mercury
- Cancer
- the Moon
- Leo
- the Sun
- Sagittarius and Pisces
- Jupiter
- Capricorn and Aquarius
- Saturn
The second significator: the quesited
Whichever house the subject of the question belongs to, the ruler of the sign on that cusp is the second significator. First find the house of the matter, then repeat the same step.
- Work, career, the boss
- 10th house
- Relationship, marriage, partnership, an opponent
- 7th house
- Money, earnings, movable property
- 2nd house
- Home, family, land, roots
- 4th house
- Children, romance, creativity
- 5th house
- Health, the workplace, daily routine
- 6th house
- Travel, study, foreign countries, law
- 9th house
- Friends, hopes, community
- 11th house
The third significator: the Moon
In every horary chart the Moon counts as a second significator of the querent. There are two reasons.
The first is speed. The Moon covers 13 degrees a day; every other body is nearly stationary beside it. That makes the Moon the body that reads the flow of events — what comes next, and how the matter will close.
The second is redundancy. When the principal significator is no use — coincident, combust, making no aspect at all — the answer is sought through the Moon. Its next aspect is, in most charts, the summary of the outcome.
Derived houses: “where is my mother's car?”
A question is not always about you. When it concerns someone else's belongings the chart is turned.
The method is simple: find that person's house, treat it as the new 1st house, and count on from there.
- My mother’s car
- Mother is the 4th house. Her car is her movable property — the 2nd house counted from the 4th. Start at 4 and move two forward: the 5th house.
- My brother’s job
- A sibling is the 3rd house. His job is his 10th. The 10th from the 3rd: the 12th house.
- My partner’s money
- The partner is the 7th house. Their money is their 2nd. The 2nd from the 7th: the 8th house — which is precisely why the 8th has been called “other people's money” since antiquity.
Derivation is one of the most practical tools separating horary from natal astrology. Even on a matter with no bearing on the querent's own life, the chart can say who is who.
Natural significators
Alongside the house rulers, certain planets are the natural representatives of certain matters. These do not depend on the house system — they are the same in every chart.
Who stands for what
- ◆Sun — father, authority, the ruler, vitality
- ◆Moon — mother, the public, daily life, change
- ◆Mercury — news, contracts, writing, short journeys
- ◆Venus — love, women, beauty, reconciliation
- ◆Mars — conflict, surgery, fire, a rival
- ◆Jupiter — law, religion, abundance, foreigners
- ◆Saturn — delay, old age, land, restriction
- ◆North Node — growth, increase (a quality, not a significator)
A natural significator does not replace the house ruler — it testifies alongside it. If the house ruler is Mars and the natural significator is also Mars, the testimony strengthens. Where they contradict, the house ruler comes first.
Once the significators are found
Three questions, in order:
1. Do they aspect each other?
An applying aspect means the connection will be made; a separating one means the window has closed; no aspect at all means the parties do not see each other.
2. Are they strong or weak?
A significator in its own sign or its exaltation is strong — the party is resolved and has resources. In detriment or fall it is weak: it may be willing and still unable. Combust (within 8 degrees of the Sun) or retrograde, it is withdrawing.
3. Is anyone interfering?
If a third planet carries light between the two (translation of light), the event happens through an intermediary even without a direct aspect. Conversely, if another planet intervenes before the aspect perfects (prohibition), or a significator turns retrograde (refranation), the connection about to form is broken.
How Astrum finds the significators
The Ascendant degree and the house cusps are computed for the exact moment of the question with Swiss Ephemeris, using the Regiomontanus house system — the house system of the classical horary tradition.
Finding which house the question belongs to is not an astronomical task but a linguistic one, and it is resolved in three layers: a keyword table first, then the stored ruling for a question already resolved, then a classifier that sees only the sentence. If none of them can place it, the asker is shown twelve topics to choose from — because a guessed house is an answer to a question nobody asked.
Once the house is known, the two significators, the critical aspect between them and the counter-testimonies are weighed by a deterministic rule engine. The AI's job is not to make the decision but to explain a decision already made.