Picatrix and the Decans: Where the Minor Arcana's Astrology Comes From

The 36 decans and the minor arcana

Tarot decans astrology is the oldest layer of the minor arcana, and most readers never touch it. Every zodiac sign divides into three faces of ten degrees. The old astronomers called them decans. The grimoires called them faces. The Golden Dawn called them something else entirely: they called them cards.

The minor arcana — the numbered cards from Two to Ten in each suit — carry a planetary ruling that most readers never notice. The Two of Wands is Mars. The Three of Wands is the Sun. The Four of Wands is Venus. This is not arbitrary decoration. It is the decan system, the oldest layer of astrology in the Western tradition, mapped onto a playing deck.

To understand why, you have to go back to the book that did it first in the Western world.

What the Picatrix actually is

The Ghayat al-Hakim, known in Europe as the Picatrix, was compiled in the latter half of the tenth century in the Islamic world. It draws on more than two hundred sources, many of them lost. The text we read in Europe is a Latin translation, made in the thirteenth or fourteenth century from a Castilian Spanish intermediary. David Pingree established the Latin text in his 1996 Warburg Institute edition.

The book is not a tarot manual. It is a manual for talismanic astrology. Its central claim is that the celestial bodies pour their virtue down through the zodiac, and that a person born under a particular degree is stamped with that virtue for life. The decans are the units of this system. Each sign has three decans. Each decan is ruled by a planet in a fixed order that rotates as you move through the twelve signs.

The Picatrix gives you a talisman for each decan. Book 2, chapter 12, lists the images, the metals, the stones, and the planetary configurations for all thirty-six faces. The first face of Aries is Mars. The second is the Sun. The third is Venus. Then the sequence shifts for Taurus, and keeps shifting, so that by the time you reach Pisces the whole wheel is complete.

This is the mechanism. A planet rules a face. The face rules a degree of the sky. The degree rules a moment in a life. The Picatrix turns that chain into a practical technology: make the right image at the right time, and you capture the virtue.

How the decan order works

The planetary order for the decans is not the order of the planets by size or by the traditional hierarchy. It is a fixed sequence: Mars, Sun, Venus, Mercury, Moon, Saturn, Jupiter, and then the cycle repeats. This is the Chaldean order, the oldest planetary sequence in Western astrology, older than Ptolemy.

When the Sun enters a sign, the first ten degrees are ruled by the first planet in the sequence. The next ten by the second. The last ten by the third. Then the sequence advances for the next sign. By the end of the twelve signs, every planet has ruled every position in the sequence exactly three times.

This is the structure that the Picatrix inherits and that it makes practical. It is also the structure that the Golden Dawn would later map onto the minor arcana.

The Golden Dawn's translation into cards

The Golden Dawn took the decan system and did something that no tarot text before it had done. They assigned each of the 36 numbered minor cards to a specific decan, so that the planetary ruling of the card is the planetary ruling of the decan.

The mapping is clean. Each suit corresponds to one element. Each element has three signs. Each sign has three decans. Three times three is nine, which is exactly the number of numbered cards in a suit (Two through Ten). The Ace and the court cards sit outside this scheme; they carry a different set of correspondences.

Here is the full mapping for one suit, to show the pattern:

• Two of Wands: Aries I, Mars
• Three of Wands: Aries II, Sun
• Four of Wands: Aries III, Venus
• Five of Wands: Taurus I, Mercury
• Six of Wands: Taurus II, Moon
• Seven of Wands: Taurus III, Saturn
• Eight of Wands: Gemini I, Jupiter
• Nine of Wands: Gemini II, Mars
• Ten of Wands: Gemini III, Sun

The same logic applies to Cups (Water: Cancer, Scorpio, Pisces), Swords (Air: Gemini, Libra, Aquarius), and Pentacles (Earth: Taurus, Virgo, Capricorn). The full table appears in Liber 777, the Golden Dawn's correspondence dictionary, in the columns titled "Angels of the Decantes" and the court card tables.

The key insight is that the card number tells you the decan position, and the suit tells you the element and therefore the sign. Two of Wands is always Aries I. Three of Wands is always Aries II. The planetary ruling follows from the Chaldean sequence, not from any arbitrary choice by the card designer.

Why tarot decans astrology matters for reading

Most readers approach the minor arcana as a set of generic meanings. The Fours are stable. The Fives are conflict. The Tens are excess. This is true as far as it goes, but it misses the layer underneath.

When you pull the Three of Wands, you are not just reading "progress." You are reading Aries II, the Sun in the second decan of Fire. The Sun in Aries is direct, assertive, visible. The second decan is the middle of the sign, where the Sun is at its full strength. The card asks not just "what is progressing" but "what is progressing with direct solar force, in the first element of the deck."

The Five of Pentacles is Mercury in the first decan of Taurus. Mercury in Taurus is slow, practical, grounded. The first decan is the entry, the beginning. The card asks not just "what is lost" but "what is lost in the practical, material domain, at the threshold of the material world."

This is not a substitution for the traditional meaning. It is a depth charge. The decan layer tells you the quality of the card's energy, the specific flavor of the planet in that particular slice of the zodiac. It turns a generic "Five of conflict" into "Mercury in the first face of Taurus: conflict over practical matters, at the threshold of the material world."

The Agrippa connection

Cornelius Agrippa's Three Books of Occult Philosophy, published in 1531, is the bridge between the medieval talismanic tradition and the early modern esoteric system. Agrippa inherited the decan structure from the Arabic and Latin astrological tradition. He gave each of the 36 decans a specific angel, a specific name, and a specific set of magical properties.

Agrippa's Book 2, chapter 26, lists the 36 decans with their planetary rulers and their associated angelic names. This is the list that the Golden Dawn used when they populated their decan columns in Liber 777. The "Angels of the Decantes (Ascendant)," "(Succedent)," and "(Cadent)" in the 777 are directly descended from Agrippa's threefold classification of the decans.

The link to the minor arcana is therefore: Picatrix (10th century, Arabic) → Agrippa (16th century, Latin) → Golden Dawn (19th century, English) → Liber 777 (1909, Crowley) → the minor arcana planetary rulings that every tarot reader uses today. The Penn State Press edition of the Picatrix translation (muse.jhu.edu) is the most accessible scholarly entry point.

For the angelic names attached to each decan, see the companion article on the 72 Names and the Shem angels. The 72 Names in the Deck: The Shem Angels and the Decans of the Small Cards

What the Ace and the courts carry

The Ace does not correspond to a decan. In the Golden Dawn system, the Aces carry the elemental essence in its pure, undifferentiated form. The Ace of Wands is the Fire element before it is shaped by any particular sign. The Ace of Pentacles is the Earth element in its raw state.

The court cards carry a different correspondence: they are mapped to the planetary rulers of the four suits, not to the decans. The Page of Wands is the Moon. The Knight of Wands is Mercury. The Queen of Wands is Venus. The King of Wands is the Sun. This is a separate layer, and it does not overlap with the decan system.

Where to find the full tables

If you want the complete 36-decan correspondence in one place, Liber 777 Revised (Neptune Press, 1955) is the standard reference. The columns for the court cards of each suit list the planetary ruling explicitly. The "Angels of the Decantes" columns give the Agrippa names. The decan-to-card mapping is implicit in the court card tables and the elemental attributions.

The Veil Tarot decan atlas (veil-tarot.com/decans) presents the full 36-card mapping in a modern format, with each card linked to its sign, decan, and planetary ruler. It is the clearest visual reference for this article's subject.

For the original source, the Picatrix in David Pingree's edition (Warburg Institute, 1996) or in the Attrell-Porreca translation (Penn State University Press, 2019) gives you the talismanic instructions for every decan, including the images, the metals, and the planetary configurations.

A practical note for readers

You do not need to memorize all 36 decans to use this layer. The key is the principle: the card number tells you the decan position, the suit tells you the element and sign, and the Chaldean sequence gives you the planet. Once you know the sequence (Mars, Sun, Venus, Mercury, Moon, Saturn, Jupiter, repeating), you can derive any card's planetary ruling from its number and suit.

This is a tool for depth, not a replacement for the traditional meaning. Use it when a card feels too vague. Use it when the same card appears in different positions and you need a way to differentiate. Use it when you want to know not just what a card means, but what quality of energy it carries.

The decans are the oldest astrological system in the Western tradition. The minor arcana are the newest. The Golden Dawn welded them together. The result is a layer of meaning that has been in every tarot deck since 1909, waiting for readers to notice it.

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