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Chaldean Wisdom: Safeguarding and Transmitting Astrological Knowledge

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Johannes Ehvass

Welcome, dear reader! Together, we embark on a captivating journey into astrology, a timeless art and science that has accompanied humanity since its earliest days. Each astrological discovery not only mirrors the era and culture it emerged from but also feels like a celestial gift, as if the universe is directly speaking to us. Through these articles, I share with you the profound journey of how astrology has grown and evolved alongside us. Let's explore this cosmic connection that has, for millennia, enriched our understanding of ourselves and the universe around us.

Enuma Anu Enlil

The Chaldeans, hailing from the southern regions of Mesopotamia, notably Babylonia, emerged not only as great astronomers and astrologers but also as keepers of celestial wisdom.

Their pivotal role in the preservation and propagation of astrological knowledge underscores the importance of their contribution to the continuity of this ancient art and science.

Guardians of Celestial Records

One cannot speak of the Chaldeans without mentioning their dedication to detailed record-keeping. Their meticulous observations and recordings of celestial movements on clay tablets, particularly lunar cycles, eclipses, and planetary movements, formed an invaluable database for future generations. These recordings weren’t just sterile data points; they were interwoven with omens, interpretations, and predictions, providing a rich tapestry of both observational astronomy and interpretative astrology.

A Guide to the Chaldean Astrological Tablets and Their Celestial Lore

Enuma Anu Enlil

The ancient Chaldeans left behind numerous astrological tablets, with some of the most important series and individual tablets as follows:

Enuma Anu Enlil

Not exclusively Chaldean but extensively used and perhaps expanded by them, this is a series of 70 tablets that constitute the core of Mesopotamian celestial omen literature. They contain a vast collection of omens, many of which are astronomical in nature, including observations of the moon, eclipses, and planets.


A compendium of astronomical knowledge that includes star lists, descriptions of constellations, and the paths of celestial bodies. It also details the lengths of daylight throughout the year and the heliacal risings and settings of stars.

Astrolabes and Planispheres

These are star charts and maps that cataloged the fixed stars and their positions, divided into three paths that the sun travels through the sky. They were used to determine the time of night and the seasons, essential for creating astrological predictions.

Astrological Reports to Assyrian Kings

These are individual tablets that contain observations and predictions specifically written for Assyrian rulers. They provide insight into how celestial omens were interpreted in relation to the fortunes of the state and the king.

Menologies and Hemerologies

Menologies are month-by-month calendars that describe the religious festivals and the lucky and unlucky days.

Hemerologies are daily calendars that list favorable or unfavorable activities based on celestial and meteorological phenomena.

The Venus Tablets of Ammisaduqa

This is a historical text that records the first appearances of Venus over a period of 21 years during the reign of King Ammisaduqa. The observations are linked with various omens and their interpretations.

The Diary Tablets:

These tablets recorded daily astronomical observations, including the phases of the moon, atmospheric phenomena, and the movements of the planets.
They often included short-term predictions based on these observations.

Almanacs and Normal Star Almanacs:

Almanacs listed predicted planetary positions and related phenomena for the upcoming year.
Normal Star Almanacs focused on the yearly appearances and disappearances of stars and constellations.


The detailed contents of each tablet or series of tablets can be quite extensive and complex. These documents are invaluable for understanding the link between celestial phenomena and terrestrial events as perceived by the ancient astrologers. They also show the remarkable observation skills and the beginnings of systematic predictive models that would influence the development of astronomy and astrology throughout history.

Not all tablets have been preserved or found, and many are fragmentary. Some of the series mentioned are known by their content rather than a specific title given in antiquity. The study and translation of these tablets is an ongoing scholarly endeavor, and new findings continue to shed light on the depth and sophistication of Chaldean astrology.

Interactions with Neighboring Cultures

The Chaldeans’ influence wasn’t restricted to Mesopotamia alone. They actively interacted with surrounding cultures, becoming a significant conduit for the transfer of astrological and astronomical knowledge. Their interactions with the Greeks, notably during the Hellenistic period, was instrumental in shaping what would later become Hellenistic astrology. Figures like Berossus, a Babylonian priest and astrologer, traveled to the Greek island of Kos and established a school where he taught Babylonian cosmology, further cementing the Chaldean influence.

Chaldeans: The Intellectual Bridge

With the conquests of Alexander the Great and the subsequent spread of Hellenism, there was a fusion of Greek and Mesopotamian cultures. The Chaldeans played a crucial role in this fusion, acting as intellectual bridges. They facilitated the synthesis of Babylonian and Egyptian astrological traditions with Greek thought, leading to the emergence of Hellenistic astrology.

Their astrological methods, especially the system of horoscopic astrology, were adopted and adapted by the Greeks. This synthesis incorporated the Chaldean zodiacal signs, houses, and planetary periods (known as ‘chronocrators’ or time-lords), giving birth to the rich tapestry of Hellenistic astrology that would later influence both Islamic and Medieval European astrological traditions.

Chaldean Numerology and Its Astrological Ties

Chaldean numerology and its astrological ties

The Chaldeans were not only pioneers in astrology but also in numerology, with their unique system known as Chaldean numerology. Rooted in the spiritual significance of numbers, this system assigns vibrational values to letters based on their sounds. Unlike the Pythagorean method, Chaldean numerology considers the number 9 as sacred and does not assign any alphabetical letter to it.

How does this tie to their astrological practices? Both Chaldean numerology and astrology focus on the interplay of cosmic and terrestrial energies in shaping human destiny. Just as planets in different zodiac signs and houses influence an individual’s path, numbers, in the Chaldean system, carry specific vibrations that can affect a person’s life.

Moreover, the Chaldeans’ deep understanding of planetary cycles, particularly the 7-year cycles of Saturn, finds echoes in their numerological practices. The number 7, for instance, holds significant importance in both their astrological and numerological traditions.


The Chaldeans, with their profound celestial wisdom, not only enriched the astrological traditions of their time but also ensured their continuity and evolution. As diligent record-keepers, innovative thinkers, and eager collaborators, they carved an indelible mark in the annals of astrological history, acting as both guardians and propagators of the stars’ secrets. Their legacy, interwoven with their spiritual numerological practices, continues to intrigue and inspire even today.

Johannes & Estel: Renowned authorities in Numerology, Astrology, and the esoteric arts. As the founders of Scandinavia's premier Numerology school, we're delighted to share our insights through this curated series on astrology. Dive in and discover the stars.

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Introduction to Astrology

The history of Astrology
Moving beyond deterministic astrology
Foundation of Astrology: Planets, Signs and Houses

Astrology and the Holographic Universe

The Holographic Universe
The Human Psyche as a Mirror to The Solar System
The Human Body as a Mirror to The Star Signs

Astrology Background

Egyptian Astrology
Mayan Astrology
Chinese Astrology
Indian Astrology - Jyotish
Celtic Astrology
Tibetan Astrology

Mesopotamian Astrology

Early Mesopotamian Astrology: The Dawn of Celestial Divination
Enuma Anu Enlil: The Epicenter of Babylonian Celestial Omen Interpretation

Babylonian and Chaldean Astrology

Babylonian and Chaldean Astrology
Chaldean influence and evolution
Chaldean Wisdom: Safeguarding and Transmitting Astrological Knowledge

Hellenistic Astrology

Hellenistic Astrology background
Claudius Ptolemy and Tetrabiblos
Vettius Valens
Dorotheus of Sidon

Persian Astrology

Persian Astrology background
Sassanian Astrology

Late Antiquity and The Transition Period

Late Antiquity and The Transition Period
Hellenistic to Islamic Transition: The Torchbearers of Astrological Wisdom

Islamic Golden Age

Arabian Astrology Background
Arabian Astrology Contributions

Medieval Astrology

Introduction: The Medieval Cosmos
Monastic Preservers: Astrological Knowledge in the Dark Ages
Astrology in Medieval Medicine
Kings, Queens, and Constellations: Astrology in the Medieval Court
The Church and the Stars: A Contentious Relationship
Universities and Scholastic Pursuits: Academic Astrology
Astronomy & Astrology: Tools of the Trade
Medieval Astrological Houses and the Synthesis of Traditions
Transition to the Renaissance: Humanism and the Celestial Arts
Reflections: Medieval Astrology's Echoes in Modern Practice
Astrological Art of the Middle Ages
Famous Medieval Astrologers
Medieval Astrological Texts

Renaissance Astrology

Renaissance Humanism and Astrology
Scientific Advancements and Astrology
The Social Fabric: Astrology in Everyday Renaissance Life
Court Astrologers of the Renaissance
Controversies and Conflicts: Astrology Under Scrutiny
Renaissance Texts and Authors: Continuation of a Tradition
Astrology and Art: Celestial Imagery in the Renaissance
Renaissance Astrological Practices: Evolutions and Innovations
End of the Renaissance: The Gradual Decline of Astrological Influence
Renaissance Astrology's Echo in the Modern World

Enlightenment Astrology

Introduction: The Enlightenment and Astrology
Challenging the Stars: Astrology's Critics during the Enlightenment
Astrology and the New World
Astrology in the 19th Century
The Dawn of Psychological Astrology
Astrology in the 20th Century: A Modern Renaissance
Astrological Associations and Schools
Modern Controversies and Astrology
Astrology and Popular Culture
Astrology and Technology
Current Trends and Future Directions in Astrology
Conclusion: Reflecting on Astrology's Evolution

The Planet Significances

The Sun in Astrology
The Moon in Astrology
Mercury in Astrology
Venus in Astrology
Mars in Astrology
Jupiter in Astrology
Saturn in Astrology
Uranus in Astrology
Neptune in Astrology
Pluto in Astrology
Chiron in Astrology
Black Moon Lilith in Astrology
Pars Fortuna in Astrology
Ceres in Astrology

Houses in Astrology

Introduction to Astrological Houses
The Angular Houses
The Succedent Houses
The Cadent Houses
The 1st House
The 2nd House
The 3rd House
The 4th House
The 5th House
The 6th House
The 7th House
The 8th House
The 9th House
The 10th House
The 11th House
The 12th House
Interaction Between Houses
Derived Houses, House Rulers, and Interceptions
Conclusion: Synthesizing House Knowledge

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