One question, asked for twenty-five centuries
Is the universe ordered, and are we inside the order?
Pythagoras said the world is number. Plato said the sky is the visible face of a living order. The Hermetic writers boiled it down to four words, as above, so below. Kepler worked out how the planets actually move and still believed the geometry meant something. Jung called the coincidences meaningful. Physics is arguing the same question today in new clothes. This is the reading room where the whole argument sits on one shelf.
The lineage
Read in order and the argument carries itself: each writer answers the one before. Dates are when the idea was written down, not when it was first thought.
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About 530 BCCroton, southern Italy
All is number
Pythagoras of Samos and the brotherhood at Croton
A man who left no writings taught that the universe is built from number, that a plucked string proves it, and that the planets make music. Everything on this shelf descends from that claim.
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About 360 BCAthens
The cosmos is alive and it keeps time
Plato, in the Timaeus
Plato took the Pythagorean numbers and gave them a body. The universe in the Timaeus is a single living creature with a soul made of ratios, and the planets are the hands of its clock.
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300 BC to 180 ADAthens, Rhodes, Rome
One body, one breath
Zeno, Chrysippus, Posidonius and the Stoic school
The Stoics said the universe is a single organism held together by a living breath, so that what happens in one part is felt in every other. That one idea, sympatheia, is the engine astrology has run on ever since.
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100 to 300 AD, and the Emerald Tablet by about 800Alexandria and the Arabic world
As above, so below
The Hermetic writers, under the name of Hermes Trismegistus
A set of Greek dialogues written in Egypt under an invented ancient name, and one short Arabic text that boiled their teaching down to a single line. The line is the premise of every chart ever cast.
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About 150 ADAlexandria
The system gets written down
Claudius Ptolemy, in the Tetrabiblos
The greatest astronomer of antiquity also wrote the textbook of astrology, and fixed the zodiac to the seasons rather than the stars. Every tropical chart, including the one next door, is still using his decision.
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1619Linz, Austria
Harmony of the world
Johannes Kepler, in Harmonices Mundi
The man who discovered how the planets really move believed to the end that their motion was music, and said so in the same book where he published the law. Harmony of the World, the chart site next door, is named for this one.
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1687Cambridge and London
When the sky became a machine
Isaac Newton, and the century that followed the Principia
Gravity explained Kepler's laws without Kepler's music, and within a lifetime astrology was out of the universities for good. The man who did it was also translating the Emerald Tablet in his spare time.
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1952Zurich
Meaningful coincidence
Carl Jung, with the physicist Wolfgang Pauli
A psychiatrist who cast his patients' horoscopes proposed that some coincidences are connected by meaning rather than cause, and tested the idea on four hundred marriages. The 11:11 on your phone is his territory.
Open questions
The modern chapters. None of these are settled, which is the point: the argument the Greeks started is still running, with better instruments.
Every moment already exists
Relativity suggests that past, present and future are all equally real, laid out together like the frames of a film. If that is right, the moment of your birth has not gone anywhere.
2003Are we rendered?
A philosopher argued that at least one of three things must be true, and one of them is that you are almost certainly living inside a computer. Plato's cave with a graphics card.
Revived 2006 onwardIs mind everywhere?
A growing number of serious philosophers argue that consciousness is a basic feature of matter, like mass or charge. The Stoics said the cosmos breathes. The modern version says it feels, a little, all the way down.
1953 and 1973The dials were set for us
A handful of numbers in the laws of physics sit at exactly the values that allow stars, carbon and chemistry. Change them slightly and nothing lives. Physicists disagree about what that means, and the disagreement is the oldest question on this shelf.
The instrument next door
Harmony of the World casts a natal chart from the real sky: planetary positions from an astronomical ephemeris, your Ascendant and houses from the time and place you were born, then the reading in plain language. It runs in your browser and keeps nothing.