Western Astrology

A natal chart is a piece of spherical geometry before it is anything else, and the mechanics are worth separating from the interpretation because they are not in dispute.

Three inputs are required: date, exact time, and place. From these the astrologer computes the positions of the Sun, Moon and planets along the ecliptic, the apparent path of the Sun through the year, expressed in degrees of the zodiac. Western practice uses the tropical zodiac, whose zero point is the position of the Sun at the March equinox, so the signs are twelve equal thirty-degree divisions of the seasonal year rather than the visible constellations of the same names.

The place and time then fix the houses, twelve divisions of the local sky measured from the ascendant, the degree rising on the eastern horizon at that moment. Because the ascendant moves roughly a degree every four minutes, an error of half an hour in a birth time changes the house structure materially, which is why astrologers ask for the time on the certificate and use rectification techniques when it is unavailable. There are several competing house systems, Placidus, Whole Sign, Koch, Equal and others, which divide the same sky differently and can put a planet in different houses on the same chart. Which to use is an unresolved argument within the practice rather than a settled matter.

Finally the aspects: the angular relationships between planets, measured in degrees along the ecliptic. Conjunction at zero, opposition at 180, square at 90, trine at 120, sextile at 60, each allowed an orb of a few degrees.

Astrologers read planet, sign, house and aspect together as a single statement. The chart itself is a computation; everything after it is interpretation.

The documented history is unusually clear for an esoteric discipline, because the sources survive.

It begins in Mesopotamia with celestial omen-reading, a state practice concerned with the king and the country rather than with individuals, recorded on tablets across the second and first millennia BCE. Individual birth charts appear only in the last few centuries BCE. What turned omens into a system was the encounter with Greek geometry and Egyptian practice in Hellenistic Alexandria from roughly the second century BCE, which produced the apparatus described above, signs, houses, aspects, rulerships, essentially complete and essentially as still used.

Ptolemy's Tetrabiblos, in the second century CE, is the surviving attempt to give the system a physical rationale, and it is a naturalistic one: the planets act by heating, cooling, moistening and drying. That is a causal theory, and it was abandoned as physics long before astrologers abandoned the practice, which left the discipline arguing about what its own mechanism is supposed to be. Arabic astronomers preserved and extended the material through the medieval period; it returned to Europe by translation, was standard learned knowledge through the Renaissance, declined among the educated from the seventeenth century, and was revived in a psychological register in the twentieth.

Two internal disputes remain live. The first is tropical versus sidereal: because of the precession of the equinoxes the tropical signs have drifted roughly a full sign away from the constellations that named them, so a person with the Sun in tropical Aries generally has it against the stars of Pisces. Western astrologers hold that the signs are seasonal divisions and precession is therefore irrelevant; Indian astrologers hold the opposite. The second is the outer planets, Uranus, Neptune and Pluto, unknown to the tradition before 1781, whose meanings were assigned in the modern period and whose inclusion traditionalists dispute.

It should be stated plainly what astrologers claim and what the testing record shows, because the two are often conflated by both defenders and critics.

The claim in most contemporary Western practice is not a claim of physical causation. Very few working astrologers hold that Saturn emits an influence. The usual formulations are either correspondence, that celestial and terrestrial patterns run in parallel without one causing the other, or a frankly symbolic and psychological reading, in which the chart is treated as a language for describing character and timing rather than as a mechanism. The stronger claim, that a chart supports specific prediction of events, is made mainly in the horary and electional branches and in traditional revival circles.

Formal testing has addressed the strong version, and the results are consistently negative. The best-known controlled trial, published in a leading science journal in 1985, asked astrologers to match natal charts to personality profiles under double-blind conditions and found performance at chance. Large-scale record studies, of time twins, of birth dates against occupation and against personality inventories, have likewise failed to find effects. The Gauquelin work of the mid-twentieth century, which reported an association between planetary positions at birth and eminence in certain professions, is the one body of results that generated sustained scientific argument; attempted replications and the dispute over selection effects left it unsettled and it is no longer treated as supporting evidence by most researchers.

Astrologers answer along several lines: that the chart is not the sort of thing a personality inventory can test, that interpretation depends on skill that a matching task removes, and that the practice is hermeneutic rather than predictive. Those are coherent replies. They are also, in the strongest versions, replies that place the claim outside the reach of testing altogether, and that consequence is worth naming.

The best-known set of degree symbols in Western astrology was produced in a single sitting in San Diego in 1925. The astrologer Marc Edmund Jones wrote each of the 360 degrees of the zodiac on a separate card, shuffled the pack face down, and worked through it with Elsie Wheeler, a medium who had severe rheumatoid arthritis and used a wheelchair. For each card drawn she reported an image; Jones recorded what she said. By his account the whole set was taken in one continuous session on a bench in Balboa Park, because he believed breaking it across days would break the unity of the result.

The name has nothing to do with the images. Jones had founded an esoteric study group called the Sabian Assembly two years earlier, borrowing the name from the Sabians, a scriptural community named in the Qur'an who were later identified with the star-venerating Harranians of late antiquity. He wanted the association with an old astral religion. No historical Sabian had any part in the 1925 material.

The symbols circulated privately in the Assembly's lesson papers for nearly thirty years before Jones published them, with his own commentary, as The Sabian Symbols in Astrology in 1953. That long gap matters for anyone trying to trace the wording, because what was in the lessons, what Wheeler actually said, and what reached print in 1953 are not guaranteed to be word for word the same thing, and Jones is the only witness to any stage of it.

Most astrologers who quote a Sabian symbol today are not quoting Jones. They are quoting Dane Rudhyar, who had used the set since the 1930s and republished it in 1973 as An Astrological Mandala. Rudhyar restated many of the images in his own words, added a one-line keynote to each of the 360, and arranged them into a structure of five-degree groups rising into larger acts, so that the set reads as one continuous cycle rather than as 360 separate omens.

His stated reason for the rewrite was that Jones's commentary was written in the practical, individualist idiom of 1920s America and had aged into it. Whether that was an improvement is a matter of taste; what is not in dispute is that the rewriting was substantial creative work of Rudhyar's own, and it is his phrasing, not Wheeler's or Jones's, that circulates on websites and in software.

That has a consequence for this atlas, and it is worth stating plainly rather than leaving a reader to wonder why these pages are thin. An Astrological Mandala carries a 1973 copyright with notice and is protected in the United States until 2069. The degree text this site held was checked line by line against the book and matched it verbatim on all 360 symbols and all 360 keynotes, so it is withheld. Reproducing a complete 360-unit set is not occasional quotation; it is the work.

It is also worth knowing that the 1925 set was not the first attempt, and that astrologers who want degree symbolism have older options. The Welsh astrologer writing as Charubel published a complete set of 360 degree images in 1898, and a second series translated by Sepharial from an Italian manuscript attributed to Antonio Borelli, usually printed as La Volasfera, circulated in the same period. Both predate the Sabian set by a generation. Their existence is a useful check on any claim that the 1925 session produced something unrepeatable: producing a complete 360-image set turns out to be a thing that more than one person has done.

That is the series this atlas uses. Each degree page here carries Charubel's 1898 image rather than the Sabian one, named as his and dated, because it says something for the degree and carries no rights problem. Three degrees have none: two because his book prints no picture for them, and one because it prints a row of stars instead of words.

The mechanics are simple. Degrees are counted from one, not from zero, so anything from 0 degrees 0 minutes to 0 degrees 59 minutes of a sign takes that sign's first symbol, and a planet at 8 degrees 30 minutes of Virgo takes the ninth of Virgo. In practice astrologers look up the symbol for a small number of chart points rather than all of them: the Sun, the Moon, the Ascendant, the ruler of the chart, and the degrees that eclipses and new moons fall on. The other common use is in prediction by solar arc or secondary progression, where a slowly moving point crosses one degree at a time and each symbol is read as the theme of a period.

There is a real disagreement about the rounding. A minority school reads the symbol for the degree a planet has completed rather than the one it occupies, which shifts every reading by one image, and there is no way to settle it from within the tradition.

The sceptical reading is not difficult to state. The images are transparently of one place and one decade: automobiles, telephones, ocean liners, flags, prospectors, and a recurring cast of Native American figures drawn from 1920s popular stereotype rather than from any particular nation. A source outside a single mind would not date so precisely to San Diego in 1925. The procedure had no controls of any kind, Jones prepared the cards, administered the session, recorded the answers, and published the account, and there is no second witness to any part of it. And the set is one of at least three complete 360-image series produced within thirty years of each other, which suggests that the achievement lies in the sustained effort of imagining 360 scenes rather than in reception from elsewhere.

None of that settles what the symbols are worth in use. A working astrologer's defence is that a degree symbol is a prompt for interpretation rather than a claim about the world, and that an image which is arbitrary in origin can still do useful work as a focus for attention. That defence is coherent. It also concedes the historical question entirely.