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Who is Who — Astrological Systems & Celestial Divination

The history of reading the heavens — studied as intellectual history, not endorsed as prediction.

The Astrological Systems & Celestial Divination Department is the Universitas Scholarium’s faculty of the history of reading the heavens — the symbolic systems by which civilisations mapped celestial patterns onto terrestrial events, studied as intellectual history rather than endorsed as prediction. Its scope spans the world’s astrological traditions across four millennia. The faculty are arranged by culture and era. The Mesopotamian omen-series and the Hellenistic astrologers Ptolemy, Dorotheus, and Vettius Valens, who built the horoscopic system the West inherited, stand with the Vedic tradition of Jaimini, the Islamic-era astrologers, and the medieval and Renaissance Western masters. The Mesoamerican calendrical systems and the Chinese traditions bring wholly independent ways of reading the sky. Each is an AI simulacrum that reasons within its own astrological tradition, while the department frames all of them historically — as a chapter in how humanity has sought meaning in the stars.

Mesopotamian & Ancient Near Eastern

The oldest stratum: the celestial-omen series of Mesopotamia, the king’s diviners who read the sky for the state, and the seasonal-mythic computation of the Syrian coast.

Enuma Anu Enlil Simulacrum(2nd–1st millennium BCE)

The Celestial-Omen Series · Sky-as-Text · Protasis–Apodosis · Omens for the State

The great canonical compendium of Mesopotamian celestial divination — some seventy tablets and thousands of omens — given a reading-mind. It treats the heavens not as nature to be explained but as šiṭir šamê, “the heavenly writing”: a text the gods inscribe. Every omen takes the form IF a precisely described sign, THEN a consequence for the king, the land, the army, or the harvest — never for a private individual. Includes the famous Venus Tablet of Ammiṣaduqa.

Can help you study: Mesopotamian celestial omens, the protasis–apodosis form, the Venus Tablet of Ammiṣaduqa, and divination for the state rather than the individual.

→ Converse with Enuma Anu Enlil

Bēl-uṣuršu Simulacrum(c. 680–650 BCE)

The King’s Celestial Diviner · Reporting-Letter · Apotropaic Rites · Neo-Assyrian Court

A reconstruction of the celestial-diviner’s office (the ṭupšar Enūma Anu Enlil) at the Sargonid court of Esarhaddon and Assurbanipal, drawn from the scholars’ own surviving letters and reports. He does not merely read the sky; he manages it — quoting the tablet that softens a dire omen, prescribing the namburbi rite that averts it, and in extremity invoking the substitute-king ritual. He holds an unresolvable tension: the truth of the omen and the peace of a king who can kill the messenger.

Can help you study: The Neo-Assyrian diviner’s office, the reporting-letter to the king, apotropaic namburbi rites, the substitute-king ritual, and omens as political management.

→ Converse with Bēl-uṣuršu

Ilimilku Simulacrum(c. 1200 BCE)

Celestial-Seasonal Computation · The Ba‘lu Cycle · Myth-as-Calendar · Ugarit

The Ugaritic scribe whose own hand copied the Ba‘lu Cycle (KTU 1.1–1.6), here reconstructed as a reader of the celestial-seasonal year. In his practice the myth is the calendar: when Ba‘lu falls to Môtu the rains have failed and the land has cracked; when ‘Anatu winnows Môtu the harvest comes. He reads sky, soil, and myth as one woven text, locating the present verse of a recurring cosmic year rather than foretelling its end. Distinct from the Ilimilku of the Royal Courts programme.

Can help you study: The Ugaritic Ba‘lu Cycle, myth as agricultural calendar, the seasonal reading of drought and rain, and the recovery of Late Bronze Age cosmology.

→ Converse with Ilimilku

Hellenistic & Roman Astrology

The foundational tradition: Ptolemy, Valens, Dorotheus, and the system that shaped Western, Islamic, and Indian astrology alike.

Dorotheus of Sidon Simulacrum(1st century CE)

Carmen Astrologicum · Electional Astrology · Lots · Hellenistic Technique

Author of the Carmen Astrologicum, written in didactic verse for memorisation. Dorotheus is the primary source for Hellenistic electional and inceptional astrology — the art of choosing the right moment to begin an undertaking. His techniques for triplicity rulers, lots, and planetary sect remain foundational to the revival of traditional astrology.

Can help you study: Hellenistic electional and inceptional astrology, the lots, triplicity rulers, planetary sect, and the techniques of the Carmen Astrologicum.

→ Converse with Dorotheus

Marcus Manilius Simulacrum(1st century CE)

Astronomica · Stoic Cosmology · Astrological Poetry · The Living Cosmos

Roman poet whose Astronomica is the earliest surviving complete astrological text in Latin. Written in hexameter verse under Augustus, it presents the cosmos as a rational, living organism governed by Stoic sympatheia. Almost nothing is known of the man himself — the poem is everything.

Can help you study: The Astronomica, Stoic cosmology, the doctrine of cosmic sympathy, and the earliest surviving Latin astrological poem.

→ Converse with Manilius

Ptolemy Simulacrum (Tetrabiblos)(c. 100–170 CE)

Tetrabiblos · Natural Astrology · Temperament · Universal vs Particular

Special astrology build of the Ptolemy simulacrum. The Tetrabiblos is the most influential astrological text ever written — the work that defined what astrology meant for the Arabic, Latin, and Renaissance traditions. Ptolemy grounds astrological influence in natural philosophy: the planets act through physical qualities, not arbitrary signification.

Can help you study: The Tetrabiblos, natural (physical) astrology, temperament and the qualities, and the distinction between universal and particular prediction.

→ Converse with Ptolemy (Tetrabiblos)

Vettius Valens Simulacrum(c. 120–175 CE)

Anthologiae · Time-Lord Techniques · Profections · Practical Delineation

A working astrologer in the Roman Empire. Where Ptolemy theorised, Valens practised — the nine books of the Anthologiae contain hundreds of example charts with real outcomes. His time-lord techniques (zodiacal releasing, profections, circumambulations) are the most sophisticated timing methods in Hellenistic astrology.

Can help you study: The Anthologiae, Hellenistic time-lord techniques, profections and releasings, and the practical casebook of an ancient working astrologer.

→ Converse with Vettius Valens

Julius Firmicus Maternus Simulacrum(4th century CE)

Mathesis · Decans · Thema Mundi · Late Antique Astrology

Author of the Mathesis, the most complete astrological textbook surviving from antiquity. Eight books covering everything from planetary dignities to the Thema Mundi — the chart of the world’s creation. Firmicus later converted to Christianity and wrote against paganism; the Mathesis belongs to his pagan period.

Can help you study: The Mathesis, the decans, the thema mundi (chart of the world), and the most complete astrological textbook of late antiquity.

→ Converse with Firmicus

Vedic & Indian Astrology (Jyotish)

The parallel tradition of the subcontinent: Parashara, Varahamihira, and the Vedic system that developed independently from its Hellenistic roots.

Jaimini Simulacrum(Classical India)

Jaimini System · Chara Karakas · Rashi Dasha · The Other Jyotish

The second great system of Indian astrology, attributed to the sage Jaimini and standing beside the dominant Parashari tradition. Where the mainstream times life through planetary dasha periods, the Jaimini approach reads the chart through the signs themselves — the movable chara karakas, the padas, and the sign-based rashi dashas. A distinct grammar for reading the same sky.

Can help you study: The Jaimini system, the chara karakas, sign-based rashi dashas, the padas, and how it differs from the Parashari mainstream.

→ Converse with Jaimini

B.V. Raman Simulacrum(1912–1998)

Modern Jyotish · The Astrological Magazine · Predictive Technique · Science of the Stars

Bangalore Venkata Raman carried classical Jyotish into the twentieth century and made it a public, defensible discipline through The Astrological Magazine and dozens of books. Unapologetic before modern science, he treated astrology as a predictive craft to be tested against results, and was famed for bold public forecasts. A bridge between the classical texts and the modern practitioner.

Can help you study: Modern predictive Jyotish, the methods of The Astrological Magazine, the defence of astrology before science, and twentieth-century technique.

→ Converse with B.V. Raman

Maharishi Parashara Simulacrum()

Brihat Parashara Hora Shastra · Dashas · Nakshatras · Vedic Foundation

The attributed author of the Brihat Parashara Hora Shastra, the foundational text of Vedic astrology. Jyotish is “the eye of the Vedas” — the limb of sacred knowledge that sees across time. The dasha system (planetary periods) and the 27 nakshatras (lunar mansions) form a timing and characterological framework entirely distinct from Western methods.

Can help you study: The Brihat Parashara Hora Shastra, the dasha systems, the nakshatras, divisional charts, and the foundations of classical Jyotish.

→ Converse with Parashara

Varāhamihira Simulacrum(c. 505 CE)

Brihat Jataka · Brihat Samhita · Panchasiddhantika · Synthesis

The great synthesiser of Indian astronomy and astrology. The Panchasiddhantika compares five astronomical systems including the Greek. The Brihat Jataka is natal astrology refined to extraordinary precision. The Brihat Samhita covers mundane astrology, natural omens, and a vast range of practical knowledge from gem-testing to architecture.

Can help you study: The Brihat Jataka and Brihat Samhita, the synthesis of Greek and Indian astrology, and the breadth of sixth-century Indian astral science.

→ Converse with Varāhamihira

Islamic-Era Astrology

The golden age of transmission and innovation: Abu Ma‘shar, al-Biruni, and Ibn Ezra carried Greek astrology into Arabic and Hebrew, transforming it in the process.

Māshā’allāh Simulacrum(c. 740–815 CE)

Early Abbasid Astrology · Elections & Interrogations · Astrological History · Persian-Jewish Transmission

A Persian Jewish astrologer of early Abbasid Baghdad (Latin: Messahala), among those said to have elected the hour for the founding of the city in 762. A master of elections, interrogations, and astrological history, he stands at the confluence of three streams — Persian, Indian, and Greek — that fed the great age of Arabic astrology, and his works passed into Latin Europe under his Latinised name.

Can help you study: Elections and interrogations, the electing of Baghdad’s foundation, astrological history, and the confluence of Persian, Indian, and Greek streams.

→ Converse with Māshā’allāh

Abū Maʿshar Simulacrum(787 CE, Balkh)

Great Introduction · Great Conjunctions · Historical Astrology · Transmission

The astrologer who transmitted Greek astrology to the Arabic world and, through Latin translation, to medieval Europe. Abū Maʿshar’s Great Introduction was the primary textbook of astrology for centuries. His theory of Great Conjunctions — that Jupiter-Saturn conjunctions mark the turning points of empires and religions — influenced political thinking well into the Renaissance.

Can help you study: The Great Introduction, the doctrine of great conjunctions, historical (mundane) astrology, and the transmission of Greek astrology into Arabic.

→ Converse with Abū Maʿshar

Al-Bīrūnī Simulacrum (Astrology)(973 CE, Kath)

Book of Instruction · Tafhim · Comparative Astrology · Mathematical Precision

Special astrology build. Al-Bīrūnī’s Tafhim (Book of Instruction) is a complete course in the mathematical sciences leading to astrology. Characteristically, he records astrological doctrines faithfully while maintaining a critical distance — noting where the evidence is weak and where the practitioners disagree.

Can help you study: The Tafhim, the mathematical foundations of astrology, a sceptic’s faithful record of the art, and comparative astral science.

→ Converse with Al-Bīrūnī

Abraham ibn Ezra Simulacrum(c. 1089, Tudela)

Beginning of Wisdom · Hebrew Astrology · Dignities · Wandering Scholar

Wandering poet, grammarian, mathematician, biblical commentator, and astrologer. Ibn Ezra wrote the Beginning of Wisdom and a series of astrological treatises in Hebrew, making the Graeco-Arabic astrological tradition accessible to the Jewish world. Born in Islamic Spain, he spent his later life wandering through Italy, France, and England.

Can help you study: The Hebrew astrological corpus, the transmission of Arabic astrology into Europe, and the integration of astrology with biblical exegesis.

→ Converse with Ibn Ezra

Medieval & Renaissance Western

From Bonatti’s Liber Astronomiae to Lilly’s Christian Astrology: the Western tradition at its most systematic and its most practically applied.

Johannes Kepler Simulacrum (Astrology)(1571–1630)

Astrological Reform · De Fundamentis · Aspects as Harmonies · The Reformer’s Scepticism

The astrological aspect of Kepler — the working astrologer who earned his bread casting horoscopes while despising most of the inherited apparatus of houses, rulerships, and terms handed down “with no reason why.” In De Fundamentis Astrologiae Certioribus he tried to keep only what could be defended, grounding the aspects in real geometric harmonies. A reformer’s scepticism turned on his own trade. Distinct from the Kepler of the Astronomy department.

Can help you study: Astrological reform, the geometric basis of the aspects, De Fundamentis, and a working astronomer’s scepticism toward inherited doctrine.

→ Converse with Kepler

Guido Bonatti Simulacrum(c. 1210, Forlì)

Liber Astronomiae · 146 Considerations · Horary · Medieval Practice

Dante placed him in the eighth circle of Hell for divination. Bonatti’s Liber Astronomiae is the most important medieval astrological textbook — ten treatises covering everything from first principles to 146 specific considerations that must be checked before any astrological judgement can be rendered.

Can help you study: The Liber Astronomiae, the 146 Considerations, medieval horary judgement, and the height of Latin astrological practice.

→ Converse with Bonatti

Marsilio Ficino Simulacrum (Astrology)(1433–1499)

De Vita · Astrological Magic · Planetary Spirit · Neoplatonic Astrology

Special astrology build. Ficino’s De Vita Coelitus Comparanda teaches how to draw down planetary influence through music, colour, image, and material. This is not superstition — it is applied Neoplatonism, grounded in Plotinus and Proclus, deployed by the head of the Florentine Academy under the protection of Lorenzo de’ Medici.

Can help you study: Renaissance astral magic, the De Vita, planetary talismans and music, and the Neoplatonic philosophy of celestial influence.

→ Converse with Ficino (Astrology)

John Dee Simulacrum (Astrology)(1527–1608)

Propaedeumata Aphoristica · Elizabethan Astrology · Optics · Navigation

Special astrology build. Mathematician, advisor to Elizabeth I, navigator, and astrologer. Dee chose the coronation date for Elizabeth using astrological election. His Propaedeumata Aphoristica attempts to ground astrological influence in optical theory — the rays of the planets as physical forces acting on the sublunar world.

Can help you study: Elizabethan astrology and natural philosophy, the casting of the coronation chart, and the union of mathematics, magic, and the heavens.

→ Converse with Dee (Astrology)

William Lilly Simulacrum(1602–1681)

Christian Astrology · Horary · Great Fire Prediction · English Tradition

Christian Astrology (1647) is the most complete horary textbook ever written in English, and possibly in any language. Lilly predicted the Great Fire of London fifteen years before it happened, was called before Parliament to explain, and was acquitted. The last great astrologer of the pre-scientific era — and the first whose case records survive in detail.

Can help you study: Christian Astrology, the most complete English horary method, the Great Fire prediction, and seventeenth-century practice.

→ Converse with William Lilly

Mesoamerican Calendrical Systems

The Tzolk’in and the Long Count: calendrical-divinatory systems that developed in complete independence from the Old World traditions.

Tzolk’in Daykeeper Simulacrum()

Tzolk’in · 260-Day Count · Nawal · Aj Q’ij · K’iche’ Maya

The Tzolk’in is a 260-day sacred calendar combining 20 day-signs with 13 numbers. The Aj Q’ij (keeper of days) is the specialist who reads the calendar, determines auspicious days, and interprets the nawal (day-sign) that defines a person’s character and destiny. This is a living tradition, still practised in Highland Guatemala.

Can help you study: The 260-day Tzolk’in, the day-signs and their auguries, the role of the daykeeper, and Mesoamerican calendrical divination.

→ Converse with the Daykeeper

Long Count Astronomer Simulacrum()

Long Count · Bak’tun Cycles · Maya Astronomy · Calendrical Mathematics

The Long Count measures time from a mythological creation date in 3114 BCE, counting in cycles of 144,000 days (bak’tuns). Maya astronomers calculated planetary periods to extraordinary accuracy, tracked Venus cycles over centuries, and embedded their findings in monumental architecture. The calendar is not prediction — it is a cosmological map of where we stand in deep time.

Can help you study: The Long Count, the computation of the Maya calendrical cycles, and the astronomy underlying the inscriptions.

→ Converse with the Long Count Astronomer

Chinese Astrological Systems

Ba Zi (Four Pillars) and Zi Wei Dou Shu (Purple Star): the two great Chinese systems of fate calculation, each with its own logic and mathematics.

Shào Yōng Simulacrum(1011–1077)

Plum Blossom Numerology · The Supreme Ultimate · Cosmic Number · Northern Song Neo-Confucianism

A Northern Song Neo-Confucian philosopher who needed no stars at all. For Shào Yōng the cosmos unfolds from the Supreme Ultimate by number, and that number is legible in anything — a sound, a knock at the door, a falling plum blossom. His Plum Blossom numerology casts a figure from any moment whatsoever, a divination by cosmic pattern rather than by the sky.

Can help you study: Plum Blossom numerology, the philosophy of cosmic number, divination from any moment or object, and Northern Song Neo-Confucian cosmology.

→ Converse with Shào Yōng

Ba Zi Practitioner Simulacrum()

Four Pillars of Destiny · Heavenly Stems · Earthly Branches · Five Elements

Ba Zi (八字, “eight characters”) calculates destiny from the year, month, day, and hour of birth, each expressed as a pair of Heavenly Stem and Earthly Branch. The interplay of the Five Elements (wood, fire, earth, metal, water) across these eight characters reveals the fundamental pattern of a life — strengths, weaknesses, favourable periods, and the timing of change.

Can help you study: Ba Zi (the Four Pillars of Destiny), the heavenly stems and earthly branches, the five phases, and Chinese calendrical fate-calculation.

→ Converse with the Ba Zi Practitioner

Zi Wei Dou Shu Practitioner Simulacrum()

Purple Star Astrology · Twelve Palaces · Star Placement · Fate Calculation

Zi Wei Dou Shu (紫微斗數, “Purple Star Astrology”) distributes over a hundred named stars across twelve life palaces: self, siblings, spouse, children, wealth, health, travel, friends, career, property, fortune, and parents. Attributed to the Song dynasty sage Chen Tuan, it is the most elaborate Chinese fate-calculation system — rivalling Western natal astrology in complexity and precision.

Can help you study: Zi Wei Dou Shu (Purple Star Astrology), the construction of the twelve palaces, the star-system, and its method of reading a life.

→ Converse with the Zi Wei Dou Shu Practitioner

Modern & Philosophical

The twentieth-century transformation: humanistic astrology, the philosophy of divination, and the question of what astrology actually is.

Greenian Depth Simulacrum(Living)

Psychological Astrology · Jungian Depth · Fate as the Unlived Unconscious · The Chart as Psyche

Based on the published work of a leading living psychological astrologer. This simulacrum is an embodiment of the structure of that published thought, not the person. In its view the planets are not forces acting upon the native but a map of the psyche, and what we call fate is largely the unlived unconscious — the chart read through a Jungian lens as an instrument of self-knowledge rather than prediction.

Can help you study: Psychological (Jungian) astrology, the chart as a map of the psyche, fate as the unlived unconscious, and astrology as self-knowledge.

→ Converse with the Greenian Simulacrum

Handian Technical Simulacrum(Living)

Hellenistic Revival · Recovered Technique · Traditional Method · Restoration of the Lost Apparatus

Based on the published work of a leading living traditional astrologer central to the modern recovery of ancient technique. An embodiment of the structure of that published thought, not the person. It works from the recovered Hellenistic and medieval apparatus — the methods the modern tradition had let lapse into a degraded copy of itself — restoring technical rigour to contemporary practice.

Can help you study: The recovery of Hellenistic and medieval technique, traditional method, and the restoration of rigour to contemporary practice.

→ Converse with the Handian Simulacrum

Ra Uru Hu Simulacrum(1948–2011)

Human Design · The Rave System · The Voice & the Mechanics · Type, Strategy & Authority

Born Alan Robert Krakower, a former advertising man who reported receiving the mechanics of the Human Design System from a “Voice” over eight days and nights on Ibiza in 1987. Human Design synthesises the I Ching, astrology, the chakra system, and the Kabbalah into a single mechanics of type, strategy, authority, and the nine centres. He framed it not as a belief but as an experiment for each person to run on themselves.

Can help you study: The Human Design System, type, strategy and authority, the nine centres, and the synthesis of I Ching, astrology, chakras, and Kabbalah.

→ Converse with Ra Uru Hu

The BodyGraph Simulacrum(Modern system)

Human Design Chart · 9 Centres · 64 Gates · 36 Channels · The Operative Instrument

The chart of the Human Design System given a reading-mind — the Rave BodyGraph itself, the operative instrument rather than a person. From a birth time to the minute and a place, it computes the two imprints (the conscious Personality and unconscious Design), the defined and open centres, the gates and the channels that form a person’s mechanics. The instrument that draws what Ra Uru Hu taught practitioners to read.

Can help you study: How a Human Design chart is computed and read — the two imprints, the defined and open centres, the gates and channels.

→ Converse with the BodyGraph

Dane Rudhyar Simulacrum(1895–1985)

Humanistic Astrology · Transpersonal · The Astrology of Personality · Cycles

Born Daniel Chennevière in Paris, Rudhyar transformed astrology from fortune-telling into a tool for psychological and spiritual self-understanding. Drawing on Jung, theosophy, and his own philosophy of cycles, he argued that the chart reveals not fate but the meaning of the individual’s life-purpose. The Astrology of Personality (1936) remains the foundational text of humanistic astrology.

Can help you study: Humanistic and transpersonal astrology, the chart as a tool for self-understanding, cyclic theory, and the shift from prediction to meaning.

→ Converse with Dane Rudhyar

Geoffrey Cornelius Simulacrum(1952–2010)

The Moment of Astrology · Divinatory Astrology · Philosophy of Practice

Cornelius asked the question astrologers avoid: what IS astrology? The Moment of Astrology (1994) argues that astrology is neither a natural science nor a symbolic language but a divinatory practice — the chart works not because the stars cause events but because the moment of the question is itself significant. The most important philosophical work on astrology since Ptolemy.

Can help you study: The divinatory turn in astrology, the philosophy of the symbolic moment, and the question of what kind of knowledge astrology actually is.

→ Converse with Geoffrey Cornelius

Diagnostic Instruments

Not persons but instruments: the classical techniques — electional, horary, and synastry — rendered as diagnostic tools the student operates.

The Electional Tool(Diagnostic instrument)

Electional Astrology · Muhūrta · Ikhtiyārāt · Choosing the Hour to Begin

A diagnostic instrument rather than a person: the classical art of election — muhūrta in the Indian tradition, ikhtiyārāt in the Arabic — rendered as a tool. Given an undertaking and a window of days, it finds the hour in which the sky best favours a beginning, fortifying the significators and steering clear of the malefics. It elects a beginning; it does not read a fate.

Can help you study: How to choose an auspicious hour to begin an undertaking — election, muhūrta, and ikhtiyārāt.

→ Converse with the Electional Tool

The Horary Diagnostic(Diagnostic instrument)

Horary Astrology · Interrogations · Praśna · The Question’s Own Sky

The art of horary — interrogations in the Western tradition, praśna in the Indian — as a diagnostic instrument. It answers a specific question from the chart of the moment the question is asked, judging the significators, their aspects, and the perfection of the matter. It reads the sky of the asking; it does not cast the querent’s nativity, and it keeps strictly to the question put.

Can help you study: How a question is answered from the chart of the moment it is asked — horary, interrogations, and praśna.

→ Converse with the Horary Diagnostic

The Synastry Diagnostic(Diagnostic instrument)

Synastry · Chart Comparison · Inter-Aspects · How Two Skies Meet

Synastry — from the Greek syn (together) and astron (star) — as a diagnostic instrument. Given two births, it overlays one sky upon the other: the inter-aspects between the planets, whose luminaries meet whose, and where one person’s planets fall in the other’s houses. It maps the dynamic of how two charts touch; it does not decree compatibility or outcome.

Can help you study: How two charts are compared — inter-aspects, house overlays, and the mapping of relational dynamics between two skies.

→ Converse with the Synastry Diagnostic