Mundane astrology: the sky over the whole world

Almost everything in this series has been about you — your birth chart, your planets, your timing. But astrology has always had a second, much older job: reading the sky over the world — nations, economies, the mood of an age. That branch is called mundane astrology, and it's where the whole art began (those first Babylonian sky-watchers were forecasting for the kingdom, not the individual).

And let's settle this right away: "mundane" does not mean boring. It comes from the Latin mundus, "the world." Mundane astrology is the astrology of the world — wars and treaties, elections and economies, the temper of a whole era. Reading the fate of nations is about the least dull thing astrology does; the word just leads an unlucky double life in English.

What it reads instead of a birth chart

A person has a birth moment — and so do other things. Mundane astrology works from:

• National (mundane) charts — a chart cast for the founding moment of a country (a declaration of independence, a constitution, a coronation). The nation is read almost like a person.
• Ingress charts — the sky at the exact moment the Sun enters a cardinal sign (the equinoxes and solstices). The Aries ingress (spring) is traditionally read as a "chart for the year" over a given place.
• The great slow cycles of the outer planets — the real backdrop of history (below).

Companies have birthdays too

Nations aren't the only things with a birth moment. Anything that starts — a company, a bank, a political party, even a ship at its launch — can be given a chart, and it's read the same way: the founding moment is the entity's "birth," and the transits touching it describe what the world is doing to it now.

The interesting puzzle is choosing which birthday. Institutions get dissolved, merged, renamed and relaunched, and the chart follows the living entity, not the name. Two rules of thumb:

• If the institution has existed continuously — however many times it changed its name or its address — its original founding chart usually stays the one that "answers."
• If the thread was truly cut — the organisation wound up, the name revived years later on a brand-new legal entity — then the relaunch is the birth that matters. The new company merely inherits the old name, the way a child can inherit a grandparent's.

A topical example: British Steel. The original British Steel Corporation was born in 1967, when Britain nationalised its steelmakers — but that corporation was privatised, merged away, and the name lay dormant for years before being revived on a completely new company in 2016. So when the government brought British Steel back into public ownership in 2026, the chart that described the company actually changing hands was the 2016 one — though a thoughtful reading might still glance at the 1967 chart the way you'd glance at a family album: the same name, walking the same circle, two generations on.

(One honest caveat: companies rarely publish a time of birth, so their charts are usually cast for midnight or noon — solid on the planetary aspects, softer on houses and angles.)

Places have charts too

If a company can have a birthday, so can a place. This is a much older idea than it sounds. In his Manual of Astrology, the 19th-century astrologer Raphael printed a horoscope for the new London Bridge — a chart for a structure, cast for its beginning and discussed as seriously as any nativity. The same book gives London itself an Ascendant, and makes a good deal of the fixed stars rising on it.

The instinct travels well beyond Europe. Indian muhūrta (electional astrology) gives whole chapters to house-building — which signs should be rising when work begins, which lunar mansions to avoid — and extends the same care to the launching of ships. Chinese practice arrives at the same place by a different road: feng shui lays a geomantic chart directly over a building's floor plan. Different tools, one shared claim — a building is a thing that begins, and beginnings can be read.

So a place can be given a chart in several ways, and they are not the same chart:

• A city or town — usually its charter or incorporation. Manchester's, for example, is generally taken from its incorporation as a borough in 1838.
• A building — the laying of a foundation stone, or the day it first opened its doors.
• An institution's home — the moment an organisation moved in, which is different again from either of those.

Layers, not replacements

Here is where the astrology of place stops being a curiosity and starts being useful.

Buildings outlive their purposes. A mill becomes flats; a chapel becomes a climbing wall; an office block becomes something nobody who built it imagined. When the use changes, what happens to the chart?

The tempting move is to pick one — the "real" chart — and throw the others away. But mundane astrology has never actually worked like that, and its most-argued example is the proof. The United States has several candidate charts: the Declaration of Independence, the Constitution, and others besides. Rudhyar, who wrote at length on all of them, was clear that while there are excellent reasons to treat the Declaration as the horoscope of the United States, many other charts have a genuine claim — and he read the Constitution's chart against the Declaration's, drawing meaning from the contact between them that neither chart could give on its own.

That's the model. Successive charts for one entity aren't rivals to be settled. They're layers, and the relationship between the layers is itself part of the reading.

Applied to a building, that gives you roughly three:

• The fabric — when the structure itself came into being. The slowest layer: what the place is like, whoever happens to be inside it.
• The use — when its current purpose began. What it is for now.
• The occupant — the person or institution living in it, read in relationship with the other two.

A change of use doesn't erase the earlier layers, any more than moving house erases your birth chart. It adds one.

A worked example: one building, three beginnings

Take Heron House on Albert Square in Manchester, which has been three quite different things inside fifty years.

• 1980 — it opens as a six-storey office and retail block, built on cleared nineteenth-century ground directly opposite the Town Hall. The fabric layer: ordinary commercial Manchester.
• Late 2019 — after a major refurbishment it becomes GCHQ's Manchester home. A radical change of use: from commerce to secrecy.
• July 2026 — part of it becomes "No. 10 North", the Prime Minister's northern base. Another change, and a stranger one — the seat of government lodged inside an intelligence agency, two hundred miles from Downing Street.

Read as layers, that's a building whose fabric is unremarkable, whose use has twice been redefined toward secrecy and statecraft, and whose current occupant carries the chart of a national office with its own far older address — 10 Downing Street, which dates to the 1730s. Four charts, in conversation with each other.

And now the part that matters more than the technique: only one of those moments is properly documented. The 1980 completion is a year, not a moment. GCHQ's Manchester site opened "in 2019" with no published day — an agency that doesn't advertise its address is not going to hand you an Ascendant. Only No. 10 North has a firm public date. The layers are real, but their precision varies enormously, and an honest reading has to say out loud which layer it knows and which it is estimating. A chart cast for noon on a guessed day is decent on the slow planetary aspects and worth very little on the houses and angles — the same caveat as for companies, only more so.

Does this have any precedent?

Partly — and it's worth being straight about which parts, because the two halves have very different standing.

Well attested: charts for cities, for structures and for institutions, and the practice of holding several founding charts for one entity and reading them against one another. None of that is new. Raphael was casting a bridge's horoscope two centuries ago, and the Declaration-versus-Constitution question is one of the best-worn debates in the literature.

An extension: treating a change of use as a formal new layer, with some notion of how the layers rank. I went looking for that in the classical sources and couldn't find it set out as doctrine anywhere. It follows naturally from the way successive national charts are already handled — but "follows naturally" is not the same as "is established practice", and you deserve to know which of the two you're being handed.

(For the curious: the neighbouring system of Human Design has an offshoot, BG5, that applies its charts to organisations — but there is nothing there for buildings. The idea of a place having a readable design doesn't appear in it at all.)

A little terminology

A quick glossary of the words you'll meet:

• Great conjunction — Jupiter meeting Saturn, roughly every 20 years. For centuries this was the mundane technique: each one marks a shift of political and economic era.
• The outer-planet cycles — slower still, and they set the weather of a whole age: Saturn–Pluto (~33–38 years: crisis, restructuring, hard power), Saturn–Uranus (the establishment versus disruption), Saturn–Neptune (ideologies dissolving and reforming), Uranus–Pluto (revolutionary waves).
• Ingress — a planet crossing into a new sign; the cardinal ingresses anchor mundane forecasts.
• Eclipses — read on the world stage: an eclipse landing on a nation's chart points is a flag for that country (the same eclipses you met earlier, scaled up).
• Rulerships — the old correspondences mapping signs, planets and houses to nations, institutions and themes (which sign "rules" which country, which planet a given industry).

The cyclic index — a barometer for the whole sky

One tool deserves its own moment: the cyclic index, devised by the French astrologer André Barbault. It's a single number that gauges how tense the sky is as a whole.

The recipe is simple: add up the angular distances between all the outer planets at a given moment. When those planets are spread out around the zodiac, the number is high — a dispersed, relatively relaxed sky. When they bunch together (several piling into the same stretch of zodiac), the number drops low — a concentrated, high-pressure sky. Plot it year by year and you get a graph of collective tension.

The striking part: the historic lows line up with the crisis eras — the early 1940s, and again around 2020–2022. It's not a crystal ball; it's a barometer. A low reading says "expect a pressured, consequential stretch," not "on this date, X happens."

You've already seen this in action

This isn't just theory here. The News section of this site — and the video editions we publish alongside it — are built on exactly these tools: ingresses, eclipses, the outer-planet cycles and the cyclic index, read over the world and the events in it. So when a headline reading talks about the "tenor of the season," that's the mundane engine speaking.

The honest bit (as always)

Mundane astrology is at its best as a reading of climate, not calendar — the tensions, themes and turning-tendencies of a time, held humbly. It doesn't name dates or decree events, and history is made by people, not planets. Treat it as thoughtful, symbolic commentary on the weather of an age — which, whatever else you make of it, is a genuinely fascinating lens on the times.

One last thought

I find something rather moving in mundane astrology: it's the same handful of symbols you'd use to understand yourself, simply turned outward to look at the whole human family at once. The oldest use of the art — and still, despite the name, one of the most alive. Mundane, maybe. Dull, never.