Christian Astrology

What it is

William Lilly's Christian Astrology, modestly Treated of in three Books, published in London in 1647: the first comprehensive astrological textbook written in English, and still the working reference for traditional horary practice.

• Book I — the introduction: symbols, the signs and planets, essential and accidental dignities, aspects, the mechanics of erecting a chart
• Book II — horary: how to judge a question, house by house, with around thirty-five worked examples taken from Lilly's own consulting practice
• Book III — nativities, with his own chart as the extended example

The title is doing work. Calling it Christian Astrology was a defence: astrology stood accused of trafficking with spirits, and Lilly's framing insisted the art was natural, lawful and compatible with faith. He also purged terminology he thought smelled of the demonic.

Where it came from

Lilly wrote it at the height of his practice and in the middle of the English Civil War, when astrology had large public significance and he had a mass readership. Writing in English rather than Latin was itself a political act of the same kind as Culpeper's translation of the pharmacopoeia two years later — both men took a body of professional knowledge and put it within reach of people without a classical education.

How it is read

Book II is why the book matters, and what makes it unlike almost any other text in this section: it is full of real cases.

Lilly gives the question as it was asked, the chart as cast, his reasoning step by step, the judgement he delivered, and what he says subsequently happened. A woman asks whether her absent husband is alive. A man asks where his stolen fish went. Someone asks whether they will recover from illness, whether a ship will come home, whether a suitor is sincere.

For the modern reader the value is double. It is a manual — the reasoning is explicit enough to learn from, which is why the 1985 Regulus facsimile edition directly triggered the twentieth- century revival of horary and why Olivia Barclay taught from it. And it is social history: a record of what ordinary Londoners in the 1640s worried about, preserved because they paid a man to consult the sky about it.

What we can and cannot say

We can say it is a genuinely great book of its kind — clear, methodical, generous with worked detail, and written by someone at the top of his craft.

We can say the case histories are the most tempting evidence for astrology anywhere in the Western literature, and that they cannot bear that weight. The reporting is entirely self-selected and self-verified. Lilly chose which cases to publish. Lilly recorded what he judged. Lilly reports what happened afterwards, without independent confirmation from anyone. We have no idea how many judgements he got wrong, because a practitioner assembling a teaching text from thirty-five successes out of thousands of consultations is doing what any author would do.

This is not an accusation of dishonesty. It is the ordinary structure of a casebook, and it is exactly why horary needs the prospective trial it has never had — sealed judgements, independent outcome verification, all cases counted including the misses. Lilly's book is what the evidence looks like without those controls, and it is persuasive, which is the problem.

We can say the book is unusually honest in one respect that deserves credit. Lilly includes cases where he was uncertain, records the considerations that told him a chart was unfit to judge, and occasionally admits error. That is more self-doubt than most of his successors show.

We cannot say how good he actually was. On his own account, very good indeed.

Further reading

• Christian Astrology (1647), Regulus facsimile (1985) or the various modern reprints.
• John Frawley, The Horary Textbook (2005) — a contemporary practitioner working from Lilly's method, useful for seeing what the tradition looks like when applied now.