Bibliography

Sources

The literature behind every forecast on Zodified.

Astrology is a two-thousand-year-old written tradition. AIstra Lumina works inside it, not by guessing, but by leaning on specific authors who shaped how the symbols are interpreted today. We name them here so you can read them yourself.

For each book we link, where possible, to its Wikipedia article. For tools and data we link to encyclopedic references rather than vendor sites.

Classical Western astrology

  1. Tetrabiblos — Claudius Ptolemy (c. 150 CE)

    The seed text of Western astrology. From here we keep the careful structure of planet-in-aspect-in-house: an astrological claim is not a vibe but a logical relation between specific things in specific places.

  2. Christian Astrology — William Lilly (1647)

    The most thorough surviving manual of horary astrology. From Lilly we take the discipline of reading a chart symbol-by-symbol rather than as a vague mood.

  3. Anthology — Vettius Valens (c. 175 CE)

    A Hellenistic working astrologer's notebook with hundreds of case examples. From Valens we keep the sense that astrology is a craft refined by use, not a closed doctrine.

  4. Astronomica — Marcus Manilius (c. 30 CE)

    A Latin poem from the early Roman empire that systematizes the zodiac. We use it as evidence that the symbolic vocabulary AIstra speaks is more than two thousand years old.

  5. The New Manual of Astrology — Sepharial (Walter Gorn Old) (1898)

    A clear late-19th-century English-language summary of classical doctrine, written for ordinary readers. Useful for verifying which rules made it intact from the Greeks to the modern shelf.

  6. How to Judge a Nativity — Alan Leo (1903)

    The book that popularized natal astrology in the English-speaking world. From Leo comes the everyday Sun-sign reading you find on every horoscope site — including ours.

Modern psychological astrology

  1. Synchronicity: An Acausal Connecting Principle — Carl Gustav Jung (1952)

    Why does symbolic reading feel meaningful at all? Jung's answer — that the psyche pairs inner and outer events into patterns the rational mind cannot help noticing — is the philosophical floor under modern astrology.

  2. The Astrology of Personality — Dane Rudhyar (1936)

    The pivot point where 20th-century astrology stopped predicting events and started describing the architecture of a personality. AIstra stands on Rudhyar's side of that fork.

  3. Saturn: A New Look at an Old Devil — Liz Greene (1976)

    What classical astrology saw as the planet of misfortune, Greene reads as the figure of necessary limit and earned mastery. From Saturn we take the modern psychological tone of the slower planets.

  4. The Astrology of Fate — Liz Greene (1984)

    A long essay on whether the chart describes free choice or predetermined story. AIstra borrows Greene's middle position: the patterns are real, the choice within them is real.

  5. Astrology, Psychology, and the Four Elements — Stephen Arroyo (1975)

    The cleanest modern map of fire–earth–air–water as four ways of being in the world. The element of a sign on Zodified almost always carries Arroyo's framing.

  6. The Twelve Houses — Howard Sasportas (1985)

    Twelve essays — one per astrological house — combining classical meaning with psychological reading. Our "this week's events fall in your nth house" framing is straight Sasportas.

Astronomical data and references

  1. Swiss Ephemeris (1997 → ongoing)

    The high-precision ephemeris library AIstra uses to know where every planet actually is. The same library professional astrologers and academic astronomers rely on; calibrated against the JPL series below.

  2. JPL DE431 — Planetary and Lunar Ephemerides — NASA Jet Propulsion Laboratory (2013)

    NASA's long-range numerical integration of the Solar System, accurate from roughly 13 200 BCE to 17 191 CE. Swiss Ephemeris compresses it into compact files; everything astronomical AIstra writes ultimately traces here.

  3. Wikidata + Wikimedia Commons — Wikimedia Foundation (2012 → ongoing)

    Where the birthdates and brief biographies of the famous-people-per-sign lists come from, plus the Creative Commons photographs used on those cards. Attribution lives on the photo-credits page.

A note on what is missing

This list is the working core, not the limit. Hellenistic, Arabic, and Renaissance astrology have hundreds of texts; modern astrology has hundreds more. We list the books AIstra actually leans on day-to-day. If you would suggest an addition, write to us via the contact form.

Methodology · Meet AIstra Lumina · Suggest a source