Guide

Horary Astrology: A Practical Guide

Horary astrology answers one question from the chart of the moment it is asked. This guide explains how a horary chart is read — the same traditional rules AstroGPT’s answers refer to — so you can ask better questions and follow the reasoning behind a verdict.

What horary astrology is

The name comes from the Latin hora, hour. A horary astrologer casts a chart for the moment a question is asked, at the place it is asked, and reads the answer from that chart alone. No birth data is involved: the question has its own “birth”, and its chart describes the matter asked about — who is involved, how strong each side is, and whether the thing will happen.

That makes horary different from natal astrology, which describes a life from a birth chart, and from sun-sign horoscopes, which describe a day for everyone born under one sign. Horary is narrow and concrete: one question, one chart, one judgment.

A short history

Horary grew out of the Hellenistic practice of casting charts for the start of an undertaking, and became a discipline of its own in the Persian and Arabic astrology of the 8th and 9th centuries, in the work of Māshā’allāh and Sahl ibn Bishr. Latin translations carried it into medieval Europe, where Guido Bonatti treated it at length in the 13th century.

William Lilly’s Christian Astrology (1647), the first major textbook in English, became the classic of the art, and most of the rules below are stated there. After a long decline, Olivia Barclay revived Lilly’s methods in the late 20th century, and teachers such as John Frawley and Deborah Houlding carry the tradition today.

How to ask a question

The chart can only answer the question actually asked, so the question matters.

• One question. “Will I get the job, and should I move?” is two questions and needs two charts.
• Concrete. Ask about a specific matter: “Will I get the job I interviewed for?”, “Will we sign the lease?”, “Where is my ring?”. “What does my future hold?” is too broad to judge.
• Sincere. Ask about something you genuinely care about now, not to test the method.
• Once. Don’t ask again because you disliked the answer. Ask again when the situation has actually changed.
• Your own business. Ask about matters that concern you. Other people’s private affairs are traditionally off limits.

Questions of the form “will it happen?”, “should I?”, “when?” and “where?” suit horary best. “Should I?” is usually judged by comparing the options, or by asking whether the thing would be good for you.

The houses: where your question lives

The chart is divided into twelve houses, counted counter-clockwise from the Ascendant, the degree rising in the east. Each house governs part of life, and the first step in any judgment is to find the house of the matter asked about. The main meanings used in horary:

Houses can be counted from other houses. Your partner is the 7th, so your partner’s money is the 2nd from the 7th — the 8th house. Your friend’s sibling is the 3rd from the 11th, the 1st.

Astrologers divide the houses in different ways. Lilly used Regiomontanus; AstroGPT uses Equal houses, each exactly 30° from the degree of the Ascendant. The house rulers — the part that matters most — are often the same either way.

Significators

Each party in the question is represented by a planet, its significator. The querent is signified by the ruler (the “lord”) of the sign on the 1st house cusp, with the Moon as a co-significator. The thing asked about — the quesited — is signified by the lord of its house: the lord of the 10th for a job, of the 7th for a partner, of the 2nd for your money.

The traditional rulers are used: Mars rules Aries and Scorpio, Venus Taurus and Libra, Mercury Gemini and Virgo, the Moon Cancer, the Sun Leo, Jupiter Sagittarius and Pisces, Saturn Capricorn and Aquarius. Uranus, Neptune and Pluto rule no sign in horary, though some astrologers note their aspects.

Planets also carry natural significations — Venus love, Mercury letters and contracts, Jupiter wealth and judges, Saturn old age and delay, Mars quarrels and cutting, the Sun kings and bosses, the Moon the public and change. These support the house rulers but don’t replace them.

How strong is a planet?

A significator’s condition describes the person or thing it signifies. Essential dignity is strength by position in the zodiac: a planet in its own sign (domicile) or exaltation is strong and acts well; lesser dignities are triplicity, term and face. In its detriment or fall it is weak or ill-disposed. A planet with no dignity at all is peregrine, with no resources of its own.

Accidental condition adds to this. Planets in angular houses (1st, 4th, 7th, 10th) are powerful, succedent houses less so, cadent houses (3rd, 6th, 9th, 12th) weakest. Speed, retrograde motion, closeness to the Sun and aspects from the benefics Jupiter and Venus or the malefics Mars and Saturn all modify the picture.

How the answer is shown

Horary uses the five aspects known since Ptolemy: conjunction (0°), sextile (60°), square (90°), trine (120°) and opposition (180°). What counts is whether the significators are applying — the faster planet moving toward the exact aspect — or separating. Applying aspects describe what will happen; separating ones, what has happened.

The usual “yes” is perfection: the significators of the querent and the quesited apply to an aspect that becomes exact before either changes sign. By a sextile or trine the matter comes easily; by a square, with effort or delay; by an opposition it may happen but bring regret; by conjunction the outcome depends on the planets’ condition.

The significators needn’t meet directly:

• Translation of light — a faster planet separates from one significator and applies to the other, carrying the matter between them, often a go-between.
• Collection of light — both significators apply to a slower planet, which brings them together.

And a promised aspect can fail:

• Prohibition — a third planet aspects one of the significators first and blocks the meeting.
• Refranation — a significator turns retrograde before the aspect perfects: someone backs out.
• Frustration — the slower significator reaches another planet before the faster one catches it.

Reception colours all of this: a planet standing in a sign ruled or exalted by another is “received” by it, which is inclined to help. Mutual reception can bring a matter about even without a clean aspect.

The Moon

The Moon is the fastest body in the chart, moving about 13° a day, and in horary it is the co-significator of the querent and a general indicator of how events flow. Its recent separating aspects show what has just happened; its next applying aspects show what is coming, and its last aspect before leaving its sign is often read as the outcome.

• Void of course. When the Moon will make no more major aspects before leaving its sign, tradition says “nothing will come of the matter”. Lilly allows an exception in Taurus, Cancer, Sagittarius and Pisces, where a void Moon still performs somewhat.
• Via Combusta. Between 15° Libra and 15° Scorpio the Moon is on the “burnt path”, a warning about the question or the chart.
• Light and speed. A waxing Moon, and one moving faster than average, are stronger and suggest matters moving; a waning or slow Moon, weaker.

The Moon’s sign and house don’t by themselves tell you the topic of the question — that is set by the question and the houses — but they describe the querent’s mood and concerns.

The Sun

The Sun rules Leo, so it is the significator of whatever house has Leo on its cusp; when the question concerns authority, the boss, the government or fame, it is also the natural significator. The Sun is never retrograde, and by its position above or below the horizon it decides whether the chart is diurnal or nocturnal, which matters for triplicity rulers.

Its main role in judgment is what it does to planets near it:

• Combust — within about 8½° of the Sun a planet is burnt up: badly weakened, unable to see or be seen. A combust significator of the querent often shows fear or being overpowered.
• Under the beams — within 17°, weakened and hidden, but less severely.
• Cazimi — within 17′ of the Sun’s exact degree, “in the heart of the Sun”: the one position near the Sun that greatly strengthens a planet.

Considerations before judgment

Before judging, traditional astrologers check whether the chart is fit to be read. Lilly’s best-known cautions:

• The Ascendant in the first 3° of a sign (too early — the matter hasn’t ripened) or the last 3° (too late — it is already decided).
• The Moon void of course.
• The Moon in the Via Combusta.
• Saturn in the 1st house, or in the 7th, where it is said to impair the astrologer’s judgment.

Authors differ on how strictly to apply these; most treat them as warnings to judge carefully rather than as bans.

Timing

When the significators perfect, the number of degrees still to travel gives a number of time units. The unit depends on how fast the chart is: cardinal signs and angular houses point to shorter units (days), mutable signs and succedent houses to middling ones (weeks), fixed signs and cadent houses to longer ones (months). Authors combine these factors in different ways, so the result is always weighed against what is plausible for the matter. Some astrologers simply watch for the date the aspect becomes exact in the ephemeris.

An example

On 6 Sep 2026, 11:07 EDT, in New York, the question was “Will I get the job I interviewed for?”. Scorpio rose, so the querent is Mars, at 16°56′ Cancer; Leo is on the 10th, so the job is the Sun, at 14°02′ Virgo. The Sun applies to a sextile with Mars (orb 2°54′) — perfection — and the Moon, just separated from the Sun, goes next to Mars, translating the light between them. Jupiter stands in the 10th. Against that, Mars is in its fall and the Sun peregrine: likely yes, on modest terms, with the aspect exact on 14 Sep 2026.

See the full chart and judgment.

What horary is not for

A horary chart is a traditional reading, not a diagnosis, a legal opinion or an investment signal. Don’t use it — or AstroGPT — in place of a doctor, lawyer or financial adviser, to predict someone’s death, or to trade and gamble. AstroGPT’s readings are offered for reflection and entertainment.

Glossary

Applying / separating

A faster planet moving toward an exact aspect with a slower one is applying; one that has passed it is separating.

Ascendant

The degree of the zodiac rising on the eastern horizon at the moment of the question. It marks the cusp of the 1st house.

Benefics and malefics

Jupiter and Venus are the benefics, Saturn and Mars the malefics; the Sun, Moon and Mercury take their colour from their condition.

Cazimi

Within 17′ of the Sun’s exact degree — “in the heart of the Sun”, the one position near the Sun that strengthens a planet.

Collection of light

A slower planet receives applying aspects from both significators and brings them together.

Combust / under the beams

Within about 8½° of the Sun a planet is combust and badly weakened; within 17° it is under the beams, hidden.

Considerations before judgment

Checks that the chart is fit to judge, such as a very early or late Ascendant or a void Moon.

Equal houses

Twelve houses of exactly 30°, each cusp at the same degree as the Ascendant. The system AstroGPT uses.

Essential dignity

A planet’s strength by sign and degree: domicile, exaltation, triplicity, term, face; detriment and fall weaken it.

Horary

Astrology that answers a question from the chart of the moment it is asked.

Lord of a house

The planet that rules the sign on that house’s cusp. The Lord of the 1st is the querent’s significator.

Natural significator

A planet that signifies a matter by its nature — Venus for love, Mercury for documents, the Sun for authority. Secondary to the house rulers.

Peregrine

Without any essential dignity where it stands: a planet with no resources of its own.

Perfection

The applying aspect becoming exact before either planet changes sign: the usual testimony that the thing happens.

Prohibition

Another planet perfects an aspect with one significator before the significators meet, blocking the matter.

Querent

The person asking. Signified by the Ascendant, its ruler and the Moon.

Quesited

The person or thing asked about, shown by the house that rules the matter: the 10th for a job, the 7th for a partner, the 2nd for money.

Reception

A planet in a sign or exaltation ruled by another is received by that planet, which is inclined to help it. Mutual reception works both ways.

Refranation

A significator turns retrograde before the aspect perfects: someone backs out.

Significator

A planet chosen to stand for a person or thing in the question, usually the lord of the relevant house.

Translation of light

A faster planet separates from one significator and applies to the other, carrying the matter between them.

Via Combusta

15° Libra to 15° Scorpio; a Moon there is a warning about the chart.

Void of course

The Moon makes no more major aspects before leaving its sign. Traditionally, “nothing will come of the matter”.

Further reading

• William Lilly, Christian Astrology (1647)
• Olivia Barclay, Horary Astrology Rediscovered
• John Frawley, The Horary Textbook
• Deborah Houlding, The Houses: Temples of the Sky