The Decans & the Minor Arcana

The Decans & the Minor Arcana

Every number card from Two to Ten in the tarot's four suits carries a precise astrological address. Behind the thirty-six pip cards lies a map of the sky divided into thirty-six decans, and the correspondence between them is one of the great structural keys of the Western esoteric tarot. This system was set down by the Hermetic Order of the Golden Dawn in the manuscript known as Book T (Liber T), and it coincides exactly with the data this app uses.

What a decan is

The zodiac is a circle of 360°, divided into twelve signs of 30° each. Split every sign into three equal parts of 10° and you get thirty-six decans (also called faces). The word comes from the Greek for "ten."

Do the arithmetic and the fit is exact:

• 4 suits × 9 number cards (2–10) = 36 pips
• 12 signs × 3 decans = 36 decans

One pip, one decan. Nothing left over.

A little history

The thirty-six decans began in ancient Egypt, where thirty-six star-groups rose on the eastern horizon at ten-day intervals across the year, serving as a stellar clock. Hellenistic astrologers inherited them as the faces of the signs, and medieval magical texts such as the Picatrix gave each decan its own image and spirit. The Golden Dawn drew this long tradition together and fastened it to the tarot's number cards, so that a deck becomes a portable model of the turning year.

The Chaldean order of the planets

Each decan is ruled by a planet, and the planets follow the Chaldean order — the classical sequence from slowest to fastest: Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon.

The Golden Dawn begins the count at 0° Aries with Mars, then runs the seven planets continuously, decan after decan, all the way around the wheel. Because seven planets do not divide evenly into thirty-six decans, the rulers keep shifting against the signs — and that is exactly what gives each pip its distinct flavour. Only the seven traditional (visible) planets are used, never Uranus, Neptune or Pluto: this is a system built before the telescope.

The full table

Here is every decan with its ruling planet and its pip. Note how the suits track the four elements: Wands = Fire, Cups = Water, Swords = Air, Pentacles = Earth.

A hidden elegance: within each element the cardinal sign always takes the 2, 3, 4, the fixed sign takes the 5, 6, 7, and the mutable sign takes the 8, 9, 10. So the Twos, Threes and Fours are cardinal cards, the Fives to Sevens are fixed, and the Eights to Tens are mutable.

Why the Aces stand apart

The four Aces have no decan. They are not one-third of a sign; they are the root of the element itself — pure Fire, Water, Air or Earth before it enters the wheel of the zodiac. Book T calls them the Roots of the Powers of the elements, seated at the pole of the sky rather than at any point on the ecliptic. When an Ace appears, think of the whole suit in seed, not a specific slice of the year.

Where the courts fit

The court cards also belong to the zodiac, but they do not sit on a single decan. In the Golden Dawn scheme each Queen, King and Knight governs a band that straddles two signs — roughly the last decan of one sign and the first two of the next — so a court card gathers three consecutive decans, and therefore three pips, under one figure. The detail is a lesson of its own; for now, simply remember that the pips carry the pure planet-in-decan energies, while the courts blend across the seams of the signs.

How to read a pip: planet in sign

This is where the system becomes a living tool. Every pip is a planet expressed through a sign — a specific cosmic weather. Read the two together:

• 5 of Cups = Mars in Scorpio. Mars is loss, cutting, force; Scorpio is depth, water, transformation. The result is not a trivial disappointment but an intense, transformative loss — grief that changes you. Book T names it the Lord of Loss in Pleasure.
• 2 of Wands = Mars in Aries. Mars in its own fiery sign is raw initiative and command — the Lord of Dominion: bold, pioneering will, the first spark of enterprise.
• 8 of Wands = Mercury in Sagittarius. Mercury (messages, speed) in far-shooting Sagittarius gives swiftness — news and movement arriving fast. Book T: Lord of Swiftness.
• 3 of Swords = Saturn in Libra. Saturn (restriction, sorrow) in Libra (relationship, balance) is the classic image of heartbreak within partnership — the Lord of Sorrow.
• 10 of Swords = Sun in Gemini. The Sun (vital force) poured into the last, most airy decan of mind-driven Gemini overextends thought to its breaking point — the Lord of Ruin.
• 9 of Cups = Jupiter in Pisces. Jupiter (expansion, blessing) at home in watery Pisces overflows with contentment — the Lord of Material Happiness, the traditional "wish card."

Notice how the traditional Book T titles — Dominion, Swiftness, Ruin, Sorrow, Material Happiness — are not arbitrary. Each is a compressed reading of this planet in this sign. Learn the planet's nature and the sign's terrain, and you can reconstruct the meaning of any pip from first principles instead of memorising the cards blind.

A method you can practise

1. Identify the pip's suit →​ its element and general field of life (Wands/Fire = will and action; Cups/Water = feeling and relationship; Swords/Air = mind and conflict; Pentacles/Earth = body, work and money).
2. Find its decan in the table →​ the sign it falls in.
3. Recall its ruling planet.
4. Combine planet + sign: what does this force do in this terrain?
5. Check against the Book T title to refine the nuance.

Do this a few times and the Minor Arcana stops being a list to memorise and becomes a coherent sky you can read. The decans are the grammar beneath the pictures — nothing here is fate, only a precise vocabulary of forces you are always free to work with.