William Lilly's Christian Astrology (1647) remains the cornerstone of horary practice. In my 30 years of teaching, I have found that students who master his core rules gain a reliable foundation for judgment. This article distills Lilly's essential guidelines into a practical summary for both beginners and seasoned practitioners.
The Foundation: The Question and the Chart
Lilly insisted that a horary chart must be judged only if the question is sincere and the astrologer is impartial. The first step is to assess whether the chart is radical—that is, fit to be judged. Lilly gave several tests: the rising sign should not be early (0–3°) or late (27–30°), and the Moon should not be void of course unless the question is trivial. If the Ascendant is between 3° and 27° and the Moon is applying to a planet, the chart is usually radical.
Once radical, identify the significators. The querent is represented by the ruler of the Ascendant and the Moon. The quesited (the matter asked) is signified by the ruler of the house that rules the question. For example, in a question about marriage, look to the 7th house and its ruler. Lilly also used the Part of Fortune and its dispositor as additional significators.
Essential Dignities and Debilities
Lilly placed great weight on essential dignities—rulership, exaltation, triplicity, term, and face. A planet in its own sign or exaltation is strong; in detriment or fall, weak. Accidental dignities (angular houses, swift motion, conjunction with fixed stars like Spica) also matter. Debilities include retrograde, combust, under the Sun's beams, or in the 12th house. A significator in its own dignity promises a positive outcome; debilities suggest obstacles.
For example, if the ruler of the 7th house is in its exaltation and angular, the marriage question is favorable. If it is retrograde and in the 6th house, delays or illness may interfere. Lilly often said that a planet in its own house or exaltation acts like a king in his castle—powerful and unhindered.
Judging the Outcome: Aspects and Translation of Light
The core of horary judgment lies in aspects between significators. Lilly preferred applying aspects (especially conjunction, sextile, and trine) over separating ones. An applying aspect between the querent's and quesited's significators indicates a positive outcome. If no aspect exists, look for translation of light: a faster planet separating from one significator and applying to another. Collection of light (two significators applying to a slower planet) also works.
If the significators are in aversion (no aspect), the matter is unlikely to succeed. Lilly also considered reception: if one planet receives another by dignity (e.g., the Moon in the sign of the 7th ruler), the matter is helped. For example, if the 7th ruler is in the sign of the Ascendant ruler, the other party is favorably disposed.
Timing and House Rulers
Lilly gave timing rules based on the signs and houses. For events, use the number of degrees between the applying aspect (or the Moon's next aspect) and the significator. Each degree can represent a day, week, month, or year depending on the question's nature. Cardinal signs suggest fast action, fixed signs slow, mutable signs moderate. The Moon's speed also matters: a fast Moon (over 13° per day) speeds things up.
House rulers are crucial. The 1st house represents the querent, the 2nd money, the 3rd siblings, the 4th home, the 5th children, the 6th illness, the 7th marriage/partnership, the 8th death/legacies, the 9th travel/religion, the 10th career, the 11th friends, the 12th enemies. Lilly often used the 4th house for the end of the matter. If the 4th house ruler aspects the Ascendant ruler positively, the outcome is good.
Common Pitfalls and Lilly's Remedies
One common error is judging a chart when the Moon is void of course (VOC). Lilly said a VOC Moon often means the question is not serious or the matter will come to nothing. However, he noted exceptions: if the Moon is in a fixed sign and the question is about something stable, it may still work. Another pitfall is ignoring the fixed stars. Lilly used stars like Algol (beheading) for violence, Spica (fortune) for success, and the Pleiades (weeping) for sorrow.
Lilly also warned against judging when the Ascendant is in the Via Combusta (15° Libra to 15° Scorpio) or when the Moon is combust. In such cases, the judgment may be clouded. He advised waiting for a better time to cast the chart. Finally, never force a judgment. If the chart is unclear, it is better to say so than to guess.
Practical Takeaway
- Check radicality first: Ensure the chart is fit to judge by examining the Ascendant degree and Moon's condition.
- Identify significators correctly: Use the house rulers and the Moon. Never skip reception—it often saves a failing chart.
- Prioritize applying aspects: An applying trine or sextile with reception is the strongest promise of success.
- Use timing conservatively: Base timing on degrees and sign modality, but always leave room for unforeseen delays.