masterSeanChan's Academy of Astrology & Feng Shui
Start freeContinue learningContinue
Account menu
Menu

Western Astrology · Medical

The body keeps the sky's time.

Learn to read the natal and horary chart through the lens of health, body constitution, and disease patterns: identify health vulnerabilities, assess temperament, time the onset and resolution of illness, and apply classical remedies.

16 modules96 lessonsLifetime access

  • The twelve signs and the parts of the body they govern, and the planets as significators of health.
  • Temperament and constitution — the humours, and what a chart says about the body it is describing.
  • The decumbiture chart, cast for the moment an illness began, and the critical days the tradition watched after it.
  • Health vulnerabilities in the natal chart, acute and chronic conditions, surgical timing, and the classical remedies.
Enrol — $497.00 USDSee the curriculum

An educational course in traditional astrology — it is not medical advice

Course artwork
A decumbiture chart: the twelve signs, the twelve houses and five bodiesA decumbiture — the chart cast for the hour an illness took hold — drawn as the wheel the course teaches. The outer ring carries the twelve signs from Aries, each in the colour of its element, and the inner ring the twelve houses, with the first house, the patient, and the sixth, the illness, tinted and numbered in gold. Five bodies are placed in their signs and houses: the Moon — marked in gold as the significator of the body's condition — in Aries in the first; the Sun and Saturn in Pisces in the twelfth; Mars in Gemini in the third; and Jupiter in Cancer in the fifth. Inside the wheel the Moon's two applying aspects are drawn: a square to Jupiter and a sextile to Mars. No Midheaven is drawn, because the lesson states none.A decumbiture · 14 March 2026, PortlandAsc 28° Pisces♈♉♊♋♌♍♎♏♐♑♒♓123456789101112ASCDSC☽☉♄♂♃☽MoonAries1st☉SunPisces12th♄SaturnPisces12th♂MarsGemini3rd♃JupiterCancer5thsquare · Moon–Jupitersextile · Moon–Mars
The course's own decumbiture chart — the hour an illness took hold — with the first house, the patient, and the sixth, the illness, in gold, and the Moon marked in the first as the significator of the body's condition.

The Technique

The chart of the hour an illness begins.

Medical astrology reads two charts together: the natal chart for the constitution, and the decumbiture — cast for the exact moment a person takes to their bed — for the illness itself. The course calls the decumbiture the single most important tool the tradition has, and teaches it beside the natal reading rather than instead of it.

  • The twelve signs and the parts of the body they govern, and the planets as significators of health.
  • Temperament, constitution and the humours, read from the chart's own testimony.
  • The decumbiture chart, and the critical days the tradition watched after it.
  • Health vulnerabilities in the natal chart, acute and chronic conditions, and the timing of a crisis.

The Problem

An illness has a chart of its own.

Medicine reads the body; the tradition read the body and the sky together. Before there was a diagnosis there was a chart — the decumbiture, cast for the moment an illness took hold — read alongside the natal chart for the constitution it was working on. That is a technical body of work: significators and their dignity, the humours, the critical days, the timing of a crisis. Almost none of it survives in modern astrology, and what survives is usually the sun-sign section of a magazine.

  • The signs and the body

    The twelve signs govern twelve regions of the body, from the head and face under Aries to the feet and diffuse systems under Pisces — module 2's own table, taught as the framework the tradition reads rather than as a diagnosis of anyone.

  • Planets as significators

    Which planet speaks for the body, which for the complaint, and how dignity and debility change what each of them can do about it.

  • Temperament and the humours

    The four temperaments and the humoral theory behind them, read from the chart's own testimony rather than guessed from behaviour.

  • The decumbiture chart

    The chart of the onset — the moment the sick person took to their bed — which the course calls the most important tool a medical astrologer has, and the reading that follows from it.

  • Critical days and crisis

    The days the tradition watched for a turn, the crisis points a chart marks in advance, and the difference between an acute condition and a chronic one.

  • Remedies and surgery

    Herbs and planetary remedies as the tradition taught them, surgical timing, and the mental-health reading — all of it alongside medical care, never instead of it.

The curriculum

16 modules · 96 lessons

  1. Foundations of Medical Astrology6 lessons
    1. What Is Medical Astrology
    2. History from Babylon to the Renaissance
    3. Medical Astrology and Modern Medicine
    4. The Astrological Body Model
    5. Tools and Resources You Need
    6. Ethics Scope and Legal Boundaries
  2. The Zodiac Signs and the Body6 lessons
    1. Aries through Virgo Body Rulerships
    2. Libra through Pisces Body Rulerships
    3. The Zodiacal Man
    4. Signs and Physical Vulnerabilities
    5. Modalities and Disease Patterns
    6. Elements and Physical Constitution
  3. Planets as Health Significators6 lessons
    1. The Sun Vitality and the Heart
    2. The Moon Fluids Fertility and Cycles
    3. Mercury the Nervous System
    4. Venus Kidneys Hormones and Pleasure
    5. Mars Inflammation Fever and Surgery
    6. Jupiter Saturn and the Outer Planets
  4. Houses in Medical Astrology6 lessons
    1. The 1st House the Body and Vitality
    2. The 6th House Illness and Disease
    3. The 8th House Crisis and Mortality
    4. The 12th House Hidden and Chronic Illness
    5. Derived Houses for Medical Questions
    6. House Rulers as Medical Significators
  5. Dignity and Debility in Medical Context6 lessons
    1. Why Dignity Matters for Health
    2. Domicile and Detriment Health Effects
    3. Exaltation and Fall in Disease
    4. Peregrine and Afflicted Planets
    5. Accidental Dignity and Medical Strength
    6. Building a Medical Dignity Assessment
  6. Temperament and Constitution6 lessons
    1. The Four Temperaments Explained
    2. Determining Temperament from the Chart
    3. The Sanguine Constitution
    4. The Choleric Constitution
    5. The Melancholic Constitution
    6. The Phlegmatic and Mixed Constitutions
  7. Humoral Theory and Astrology6 lessons
    1. The Four Humors
    2. Hot Cold Wet and Dry Qualities
    3. Planetary Humor Correspondences
    4. Signs and Humoral Balance
    5. Diagnosing Humoral Imbalance
    6. Restoring Balance Through Contraries
  8. The Decumbiture Chart6 lessons
    1. What Is a Decumbiture
    2. Casting the Decumbiture Chart
    3. Key Significators in Decumbiture
    4. The Moons Role in Prognosis
    5. Prognosis and Outcome Indicators
    6. Historical Decumbiture Examples
  9. Diagnosing Illness in the Natal Chart6 lessons
    1. Identifying the Significator of Illness
    2. Afflictions to the Ascendant and Its Ruler
    3. The 6th House Ruler and Disease Type
    4. Malefics in Health Houses
    5. Aspect Patterns Indicating Disease
    6. Synthesizing the Medical Chart
  10. Acute Chronic and Recurring Conditions6 lessons
    1. Cardinal Signs and Acute Illness
    2. Fixed Signs and Chronic Illness
    3. Mutable Signs and Recurring Conditions
    4. Planetary Speed and Duration
    5. Timing the Course of Disease
    6. Recovery Indicators
  11. Critical Days and Crisis Points6 lessons
    1. The Doctrine of Critical Days
    2. Lunar Quarters and Disease Turning Points
    3. The 7th 14th and 21st Day
    4. Calculating Critical Days from Decumbiture
    5. Judicial Days vs Critical Days
    6. Applying Critical Days in Practice
  12. Herbs and Planetary Remedies6 lessons
    1. The Doctrine of Signatures
    2. Solar and Lunar Herbs
    3. Mercury Venus and Mars Herbs
    4. Jupiter and Saturn Herbs
    5. Sympathy and Antipathy in Remedies
    6. Culpepers Method in Practice
  13. Surgical Timing6 lessons
    1. The Moon and Surgical Timing
    2. Avoiding the Sign Ruling the Affected Part
    3. Malefics and Surgical Risk
    4. Electing a Favorable Surgery Chart
    5. Emergency vs Elective Surgery
    6. Post Surgical Recovery Indicators
  14. Mental Health and the Chart6 lessons
    1. Mercury and the Rational Mind
    2. The Moon and Emotional Health
    3. Saturn Melancholy and Depression
    4. Mars Anger and Anxiety
    5. The 12th House and Hidden Suffering
    6. Traditional Approaches to Mental Wellness
  15. Case Studies in Medical Astrology6 lessons
    1. Reading a Medical Chart Step by Step
    2. Case Study an Acute Fever
    3. Case Study a Chronic Digestive Complaint
    4. Case Study a Surgical Election
    5. Case Study a Mental Health Question
    6. Common Mistakes and How to Avoid Them
  16. Building Your Medical Astrology Practice6 lessons
    1. Scope of Practice and Legal Boundaries
    2. When to Refer to Medical Professionals
    3. Communicating Sensitive Findings
    4. Integrating Traditional and Modern Approaches
    5. Building a Medical Astrology Practice
    6. Recommended Classical Texts

What's included

  • 96 lessons in 16 modules
  • Lifetime access
  • Online, at your own pace
Sean Chan at his laptop by a red lacquered window, a chart open on the screen

Your Instructor

Taught by Master Sean Chan

A Singapore-based astrologer and Chinese-metaphysics consultant with more than 15 years of practice and 10,000+ clients served — the same standard here as in private consultation, with every claim checked against the chart.

Read my story
  • 10,000+professional readings
  • 15years of practice

As featured in

  • CNA
  • South China Morning Post
  • Harper's Bazaar
  • Lianhe Zaobao
  • Rice Media
  • T Singapore, The New York Times Style Magazine
  • Our Grandfather Story
  • HeyKaki
  • ZULA

Common Questions

Before you enrol.

  • Is this medical advice?

    No. It is an educational course in traditional astrology, and the course is emphatic about the line: medical astrology is a symbolic and educational framework, not a healthcare service. It cannot diagnose disease, it cannot prescribe treatment, and it cannot replace professional medical care — the course's own words are that a client presenting with symptoms needs a doctor, not a chart reading. What it teaches is a traditional way of reading a chart alongside medical care, never instead of it.

  • What is a decumbiture chart?

    The chart cast for the exact moment a person falls ill — the point at which symptoms become undeniable and the sick person takes to their bed. The word comes from the Latin decumbere, to lie down. The course devotes a module to it and treats it as medical astrology's equivalent of the horary chart: the single most important prognostic tool the tradition has.

  • What does the course cover?

    Foundations and the limits of the discipline; the twelve signs and the parts of the body; the planets as health significators; the houses in a medical reading; dignity and debility; temperament and constitution; humoral theory; the decumbiture chart; diagnosing illness in the natal chart; acute, chronic and recurring conditions; critical days and crisis points; herbs and planetary remedies; surgical timing; mental health and the chart; case studies; and how to structure a medical astrology practice within its proper scope.

  • Do I need to have studied astrology before?

    The decumbiture is read with the same instruments horary astrology uses — significators, receptions, the Moon's applying aspects — so if you have studied horary you will find familiar ground here, applied to health. The course builds the reading from its own foundations, and states its scope as it goes.

  • How is the course delivered?

    Entirely online, on this academy, in written lessons and fully self-paced: no deadlines, no scheduled classes to keep, and no app to install. Lifetime access is included.

  • Can I get a refund?

    You may request a full refund within seven (7) days of purchase, provided you have not completed more than 20% of the course content. See the Terms & Conditions.

Enrolment

One course. One price.

The complete course in traditional medical astrology — the signs and the body, temperament and the humours, the decumbiture chart, the natal vulnerabilities, the critical days, the remedies and the timing of surgery — open to you as soon as you enrol, and taught with the limits of the discipline kept in view throughout.

  • Every module and lesson of the course, opened in full
  • Secure checkout, with access opening on payment
  • Self-paced, in your browser on a phone, tablet or computer

The Complete Medical Astrology Course

16 modules · 96 lessons · lifetime access

  • Pay in full$497.00 USD one-time payment
Enrol now

An educational course in traditional astrology, not medical advice · Questions before you enrol? Message me on Instagram @masterSeanChan