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90

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Origin 1908 to 1965

Ninety is 2 x 45, with twelve divisors. Its importance is geometric: a quarter turn is ninety degrees, which follows from the Babylonian division of the circle into 360, itself chosen for divisibility rather than for any astronomical exactness. Genesis 17:17 gives Sarah's age as ninety when Isaac's birth is promised. Beyond that ninety has little symbolic tradition of its own and functions as a structural number in measurement rather than as a sign. In digit-reduction numerology it reduces to 9.

Facts
Origins
Origin Period
1908 to 1965 1
Origin Period
500 BCE to 300 CE 2
Origin Period
The arithmological reading of the first numbers, one as source, two as division, four as justice, seven as virgin, ten as completion, reaches us through Platonic and Neopythagorean writers of the centuries after Plato. Burkert's finding is that it cannot be traced to Pythagoras himself, whose activity was religious rather than mathematical: the doctrines were credited backwards to him. 2Tradition: Pythagorean and Neopythagorean number lore
Origin Period
The system that gives a number a personality, and a person a number, was assembled in the United States in the first half of the twentieth century out of New Thought material. Balliett's The Philosophy of Numbers appeared in 1908; the chart positions, pinnacles and cycles were added by her successors over the next fifty years. 1Tradition: Modern name numerology (Mrs. L. Dow Balliett and her successors)
Place of Origin
The Greek world, and above all the Greek cities of southern Italy where the Pythagorean societies were established; the arithmological literature itself is later and largely eastern Mediterranean. 2Tradition: Pythagorean and Neopythagorean number lore
Place of Origin
The United States, and specifically the New Thought circuit of the north-eastern seaboard; Balliett worked from Atlantic City. 1Tradition: Modern name numerology (Mrs. L. Dow Balliett and her successors)
Attributed Author / Compiler
Attributed by the tradition to Pythagoras. Burkert's study is the standard demonstration that the number-doctrines carrying his name are the work of later hands, and that almost nothing in them can be shown to go back to the sixth century BCE. The attribution is recorded because it is what the tradition says, not because it holds. 2Tradition: Pythagorean and Neopythagorean number lore
Attributed Author / Compiler
Mrs. L. Dow Balliett, who published the first version of the modern system in 1908 and to whom Dudley devotes a chapter. What later authors added, the pinnacles, the challenges, the cycles, the personal year, is theirs, and this atlas's own numerology-position entries cite four different authors between 1908 and 1965 for what is presented as one system. 1Tradition: Modern name numerology (Mrs. L. Dow Balliett and her successors)
Origin of the Name
Pythagorean numerology is a twentieth-century label. The system it names has no demonstrable descent from Pythagoras, from the Pythagorean societies, or from the ancient arithmological literature; the letter-value chart it rests on was drawn up in the United States after 1900. The name borrows a pedigree, the oldest move in the subject. 1Tradition: Modern name numerology (Mrs. L. Dow Balliett and her successors)
Attestation
Meaning in the Attesting Source
Babylonian astronomy divided the circle into three hundred and sixty degrees, a scheme built on its base sixty counting, and a quarter of that circle, ninety degrees, became the right angle that later Hellenistic and then Western geometry inherited unchanged. The degree and the right angle both descend from Mesopotamian sky watching rather than from any purely geometric first principle. 3Tradition: Babylonian astronomy and mathematics
Status
Standing as a Comparative Category
Largely abandoned as a comparative category 1
Modern Numerology
Reduction in the Modern System
The modern system reduces every number above nine by adding its digits: 9 + 0 = 9. Whatever the system says of 90 it therefore says of 9, because it holds no separate doctrine for the higher numbers. The stated exceptions are 11, 22 and 33, which it leaves unreduced and calls master numbers. 1Tradition: Modern name numerology (Mrs. L. Dow Balliett and her successors)
Contested Use
Contested or Appropriated Modern Use
Numerology has been sold since Balliett as a basis for decisions: which name to take, which date to marry on, which house number to buy. Dudley's survey of what numerologists sell is the standard critical account and its finding is blunt, numbers have power over minds, not over events. These entries record what the tradition says, not advice. 1
Learn More
The Age of Sarah

Ninety reduces to nine. Its scriptural anchor is the age of Sarah when, long past the years of childbearing, she was promised and then bore Isaac, she laughed at the news, and the child was named for the laughter, so ninety marks the impossibility that the covenant overcomes. In Hebrew the letter tsade carries the value ninety. The number is also the measure of the right angle, ninety degrees, a quarter of the circle, though that is a convention of Babylonian degree-reckoning rather than a symbolic property.

In chemistry, ninety is the atomic number of thorium, named after Thor, the Norse god of thunder, and discovered by Jons Jacob Berzelius in 1828.

Ninety factors as 2 x 3^2 x 5 and carries 12 divisors in all. Summing its proper divisors gives 144, more than the number itself, which makes it an abundant number in the classical sense the Pythagoreans used to sort integers into deficient, perfect and abundant classes.

The whole apparatus of digit-reduction numerology is a twentieth-century invention rather than an inheritance from antiquity. Mrs. L. Dow Balliett published the first systematic version, The Philosophy of Numbers, in 1908, fixing the letter-to-number chart still used today and ruling that eleven and twenty-two must stand as master numbers rather than reduce further; her colleague, the physician Julia Seton, is credited with coining the word numerology itself around 1912.

What the Systems Assign

Beyond the age of Sarah and the value of the letter tsade, ninety carries little developed symbolism; its reduction to nine ties it to completion and fulfilment, and modern numerology reads it accordingly. The number's honest content is the scriptural figure of Sarah's late motherhood, the round ninety standing for a promise fulfilled against nature, a fitting resonance for a number that resolves to the nine of completion.

Nicomachus's own arithmetic sorted whole numbers into deficient, perfect and abundant by comparing them with the sum of their own divisors, a genuinely ancient classification that has nothing to do with the letter charts later numerologists built; the modern system that assigns meaning to digit sums is a distinct, twentieth-century construction that happens to borrow the Pythagorean name.

None of this genealogy is hidden by the numerologists themselves: Balliett, Campbell and Jordan each wrote openly as originators and systematisers rather than as transmitters of a secret ancient science, and the chain from Balliett's 1908 book through Campbell's 1931 manual to Jordan's 1965 standardisation is well documented in the numerology literature's own bibliographies.

Where the Chaldean chart and the Balliett-descended chart assign different values to the same letters, a name totalling one figure in one system need not total the same figure in the other, since the two rest on unrelated letter-value tables rather than on a shared inheritance from any single ancient source.

Cross-Tradition Connections

Disciplines That Use This

Numerology, Disciplines

The modern numerological system assigns this number a meaning, which is why the atlas records it as a subject in its own right, though this does not endorse what the discipline says about it. This link shows only that the discipline works with this particular number; the readings of the number itself belong to whichever tradition holds them.

Source Numerology: Or, What Pythagoras WroughtUnderwood Dudley
Sources
1. Numerology: Or, What Pythagoras Wrought
Underwood Dudley, Mathematical Association of America (Spectrum series), 1997View the Source
2. Weisheit und Wissenschaft: Studien zu Pythagoras, Philolaos und Platon (Lore and Science in Ancient Pythagoreanism)
Walter Burkert, Harvard University Press, 1962View the Source
3. The Heavenly Writing: Divination, Horoscopy, and Astronomy in Mesopotamian Culture
Francesca Rochberg, Cambridge University Press, 2004View the Source
The Hebrew Bible (Tanakh)
Anonymous (multiple authors)Genesis 17:17 (Sarah at 90)View the Source
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