What are the Egyptian decans?

Thirty-six stars and star groups that rise one after another along the eastern horizon through the Egyptian year, a new one taking over roughly every ten days. The Egyptians used their risings to tell the hours of the night and to structure the calendar into ten-day weeks. The Greeks later called them dekanoi, the tens, and folded them into the zodiac as subdivisions of the signs.

How did the decans tell time at night?

About a dozen decans rise between dusk and dawn on any given night, so each rising marked off one hour. The diagonal star tables painted inside coffin lids around 2100 BCE tabulate which decan marks which hour for every ten-day week of the year. Because each star rises about four minutes earlier per night, the names shift one row every week or so, producing the diagonal pattern the tables are named for.

Why are there exactly thirty-six decans?

The number falls out of the calendar. The Egyptian civil year had 360 days in twelve months of thirty days, plus five feast days outside the count. Divided into ten-day weeks, that gives thirty-six weeks, and one decan was assigned to each as its marker star. The fit with the later zodiac is equally neat: thirty-six decans of ten degrees each fill the 360-degree circle, three to a sign.

What is the heliacal rising of Sirius, and why did it matter?

Sirius vanishes into the sun's glare for about seventy days each year at Egypt's latitude, and its heliacal rising is the first morning it reappears in the dawn sky. That morning marked the Egyptian New Year and arrived close to the start of the Nile flood, on which the whole agricultural year depended. The star was worshipped as Sopdet, and its seventy hidden days set the traditional length of mummification.

Is the 24-hour day really Egyptian?

Yes, in origin. The Egyptians divided the night into twelve hours marked by decan risings and the day into twelve hours measured by shadow clocks, giving twenty-four in all. Their hours changed length with the seasons; Greek astronomers in Alexandria kept the count of twenty-four but made the units equal for calculation. The count itself, twelve and twelve, comes from the decans.

Which stars were the decans?

Mostly unknown. Sirius was the decan Sopdet, and the stars of Orion formed Sah, but beyond these two anchors nearly all proposed identifications remain conjecture. The lists give names and images, not coordinates, and the observing rules behind them are reconstructed from the tables themselves. Neugebauer and Parker, who edited the sources, concluded that certainty is out of reach for most of the thirty-six.

What are decans in modern astrology?

Subdivisions of the zodiac signs. Each sign is cut into three segments of ten degrees, and each segment, called a decan or face, has its own planetary ruler. The classical scheme assigns rulers in the descending Chaldean order beginning with Mars in the first decan of Aries; a rival scheme popular in newspaper astrology assigns them by triplicity. Astrologers use decans to shade the meaning of a planet's position within its sign.

How do the decans connect to tarot cards?

Through the Golden Dawn's attributions, worked out in London from 1888. Each numbered minor card from Two to Ten is assigned to one of the thirty-six decans, with the suit fixing the element and the card's number fixing the segment, so the Five of Cups is Mars in the first decan of Scorpio. The Rider-Waite deck was designed inside this scheme and the Thoth deck prints it on the cards, so decan symbolism underlies most modern pip readings.

What is the Dendera zodiac?

A circular sky map carved around 50 BCE on a chapel ceiling of the temple of Hathor at Dendera, and now in the Louvre. It shows the twelve Babylonian zodiac signs surrounded by the thirty-six Egyptian decans around the rim, with planets and eclipses placed among them. It is the clearest surviving picture of the moment the native decan calendar and the imported zodiac merged into one system.

Were the decans used for magic and healing?

Extensively. Late Egyptian temples treated the decans as emissaries of Sekhmet who could send or avert plague, and Greco-Egyptian handbooks assigned each decan a body part, a stone and a plant, so that an engraved gem could protect the organ its decan ruled. The Testament of Solomon lists thirty-six decan spirits with the ailments they cause, and the Picatrix and Agrippa carried the talisman images into European magic.

Egyptian Decans: The 36 Stars That Told Time

Egyptian decans

Thirty-six star groups rising one after another through the Egyptian night, painted on coffin lids around 2100 BCE as the oldest star clocks in the world. They divided the night into twelve hours, gave the year its ten-day weeks, and then outlived Egypt itself as the faces of Hellenistic astrology, the talisman images of the Picatrix and the thirty-six numbered cards of the tarot.

36: decans
12: night hours
4,000: years

The decanal tradition

Twelve chapters of one idea, from timekeeping on coffin lids to talisman images and tarot cards. Follow the decans as each age puts them to a new use.

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Diagonal star tables

Asyut & Middle Egypt c. 2100 BCE

Grids painted inside wooden coffin lids, mostly from Asyut, listing which decan rises in which hour of the night through the thirty-six weeks of the year. Because each star's hour shifts as the year advances, the names step across the grid in a diagonal, which gives the tables their modern name. They are the oldest star clocks known.

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Sirius, Sothis and the year

Egypt 3rd millennium BCE onward

Sirius, the goddess Sopdet to the Egyptians and Sothis to the Greeks, was the first and greatest decan. Its return to the dawn sky after seventy days of invisibility announced the New Year and the Nile flood. The civil calendar of 365 days drifted against it by a day every four years, a slow slippage now called the Sothic cycle.

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The twelve hours of the night

Egypt Middle Kingdom onward

On any one night roughly twelve decans rise in succession, so the night fell into twelve hours, longer in winter and shorter in summer. Paired with twelve hours of day, and later evened out by Greek astronomers into equal units, this Egyptian habit of counting by decans is the direct ancestor of the 24-hour day.

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The Ramesside star clocks

Thebes c. 1100 BCE

A New Kingdom refinement painted in the tombs of Ramesses VI, VII and IX. An observer watched a colleague seated facing him and recorded each star as it passed over his heart, ear or shoulder, with a fresh table for every half month. Transit observation replaced risings, trading the old decan list for finer accuracy.

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Astronomical ceilings

Thebes & Abydos c. 1470 BCE onward

The decans moved from coffin lids to the ceilings of tombs and temples. The unfinished tomb of Senenmut at Deir el-Bahri holds the earliest known astronomical ceiling, and the cenotaph of Seti I at Abydos carries the Book of Nut, which explains the decans' seventy days of invisibility as a spell in the underworld.

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Decans as gods

Egypt Late Period

By the first millennium BCE the thirty-six were no longer just timekeepers but powers, messengers of Sekhmet who could send plague or turn it aside. Their figures appear on temple walls, water clocks and protective amulets, each with its own name, image and district of the sky, a habit of picturing them that never left the tradition.

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The Dendera zodiac

Dendera c. 50 BCE

On a chapel ceiling of the temple of Hathor, now in the Louvre, the thirty-six decans circle the rim of a round sky that also carries the twelve signs newly arrived from Babylon. It is the meeting of the two systems in a single image: the native Egyptian star calendar wrapped around the imported zodiac it was about to join.

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The faces of astrology

Alexandria 2nd century BCE onward

Hellenistic astrologers cut each zodiac sign into three segments of ten degrees and poured the decans into them, thirty-six faces with a planetary ruler apiece, assigned in the descending Chaldean order from Mars at the start of Aries. The decan became a subdivision of the sign, which is how astrologers have used it ever since.

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Decanal medicine and magic

Greco-Roman Egypt 1st–4th century CE

The Sacred Book of Hermes to Asclepius assigns each decan a body part, a stone and a plant, so an engraved gem could ward the organ its decan ruled. The Testament of Solomon marches thirty-six decan spirits past the king, each confessing the illness it causes and the name that expels it. Healing, not forecasting, was the point.

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The Arabic transmission

Baghdad & al-Andalus 9th–11th century

Abu Ma'shar's Great Introduction laid out three rival image sets for every decan, Persian, Indian and Greek, and the Picatrix turned the lists into working talisman recipes. Translated into Latin in the twelfth and thirteenth centuries, these books carried the decan images into Europe with their Egyptian ancestry barely legible.

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The Renaissance return

Ferrara & Cologne 15th–16th century

In the Palazzo Schifanoia at Ferrara, painted around 1470, three strange figures preside over each month; they are the decans, arrived by way of Abu Ma'shar. Agrippa's Three Books of Occult Philosophy printed the faces and their images for every learned magician in Europe, keeping the talisman tradition alive in print.

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The decans in tarot

London 1888 onward

The Golden Dawn assigned each numbered minor card from Two to Ten to one of the thirty-six decans, pairing the card's suit element with the sign and its number with the segment, so the Five of Cups is Mars in the first decan of Scorpio. Through the Rider-Waite and Thoth decks, that scheme still shapes how the pips are read.

The people who carried it

Builders, compilers, magicians and scholars through whom the thirty-six passed on their way from the Nile to the present.

Senenmut

fl. c. 1470 BCE Egypt

Steward and architect of Hatshepsut whose unfinished tomb at Deir el-Bahri preserves the earliest known astronomical ceiling, with its decan list, northern constellations and lunar calendar.

Nechepso & Petosiris

2nd century BCE Egypt

Pseudonymous king and priest under whose names the founding corpus of Greco-Egyptian astrology circulated, carrying the decans into horoscopic technique with Egypt's authority behind them.

Teucer of Babylon

1st century CE Egypt

Astrologer from the Babylon fortress near modern Cairo, not the Mesopotamian city, whose catalogue of the decans and the stars rising alongside each one fed image lists used for a thousand years.

Firmicus Maternus

4th century CE Sicily & Rome

Author of the Mathesis, the longest astrological handbook to survive from antiquity, which treats the decans as potent subdivisions of the signs and hints at still finer spirits within them.

Hephaistion of Thebes

c. 380–415 CE Egypt

Egyptian astrologer whose Apotelesmatika folded the older Nechepso-Petosiris material, decans included, into the Greek synthesis just as the temples that had kept the star lists were closing.

Abu Ma'shar

787–886 Balkh & Baghdad

The most influential astrologer of the Islamic world, whose Great Introduction preserved the Persian, Indian and Greek image sets for all thirty-six decans and became Europe's source for them.

Heinrich Cornelius Agrippa

1486–1535 Cologne

Encyclopedist of Renaissance magic whose Three Books of Occult Philosophy printed the decan faces with their images and talisman uses, fixing the form in which occultists would inherit them.

Aby Warburg

1866–1929 Hamburg

Art historian who in 1912 identified the enigmatic figures of the Schifanoia frescoes as the decans and traced their journey from Egypt through Abu Ma'shar to Ferrara, founding a whole method on the find.

Wilhelm Gundel

1880–1945 Germany

Classicist whose Dekane und Dekansternbilder of 1936 gathered the decan names, images and texts from Egyptian, Greek, Arabic and Latin sources into the standard study of the tradition.

Otto Neugebauer & Richard Parker

1899–1990 & 1905–1993 United States

Historian of ancient science and Egyptologist whose three-volume Egyptian Astronomical Texts edited the star clocks and ceilings, putting the study of the decans on its modern documentary footing.

What the decans are

The decans are thirty-six stars and star groups that the Egyptians watched rising one after another along the eastern horizon. A new decan took over the role of year-marker every ten days, which is why the Greeks later called them dekanoi, the tens. Thirty-six decans of ten days each cover the 360 days of the Egyptian civil year, with five feast days added outside the count to reach 365. The system is native to Egypt and older than the zodiac by some fifteen centuries: it appears fully formed on coffin lids around 2100 BCE, and its descendants were still being painted on Italian palace walls in the Renaissance. No other piece of astrological machinery has travelled so far from its starting point.

Clocks painted for the dead

The oldest decan documents are the diagonal star tables, grids painted inside wooden coffin lids, most of them from Asyut in Middle Egypt. Each column of the grid belongs to one ten-day week of the year and lists, top to bottom, the decans that mark the twelve hours of that week's nights. Because every star rises about four minutes earlier each night, a decan that marks the twelfth hour in one week marks the eleventh a week or so later, so each name steps upward across the grid in a long diagonal. The tables were not instruments for the living; they were provisions for the dead, who would need to know the hours in the world below. It is a habit of thought the tradition kept: in Egypt the stars that told time were never separate from religion.

Sirius, the flood and the year

The first of the decans was Sirius, the brightest star in the sky, worshipped as the goddess Sopdet and known to Greek astronomy as Sothis. Every year the star disappears into the sun's glare and stays invisible for about seventy days at Egypt's latitude, and its first reappearance in the dawn sky, the heliacal rising, fell close to the start of the Nile flood. That morning opened the Egyptian year. The seventy days of invisibility were read as the star's death and embalming, and the same span became the canonical length of mummification for human beings. Because the civil calendar of exactly 365 days lacks a leap day, it slid against Sirius by one day every four years, coming back into line only after some 1,460 years, a period Egyptologists call the Sothic cycle and use to anchor Egyptian chronology.

Where the 24-hour day comes from

On any single night, roughly a dozen decans rise between dusk and dawn. The Egyptians therefore divided the night into twelve hours, marked by twelve successive decan risings, and balanced them with twelve hours of daylight measured by shadow clocks. These hours breathed with the seasons, stretching in winter nights and shrinking in summer. When Greek astronomers in Alexandria wanted units fit for calculation, they kept the Egyptian count of twenty-four but made the hours equal the year round. Every clock on earth now keeps Egyptian time in this one respect: the day has twenty-four hours because about twelve decans cross the horizon in a night on the Nile.

Refinements of the New Kingdom

The simple rising scheme decayed as the calendar drifted, and the New Kingdom rebuilt it twice. The ceiling of Senenmut's unfinished tomb at Deir el-Bahri, from about 1470 BCE, is the earliest astronomical ceiling known, laying out the decan list beside the northern constellations and the lunar calendar. The cenotaph of Seti I at Abydos carries the Book of Nut, which narrates the decans' year as a life: each star spends seventy days dead in the Duat, is purified, and rises again. In the tombs of Ramesses VI, VII and IX, around 1100 BCE, a different method appears. An observer sat facing a colleague and noted each star as it crossed his partner's body, over the heart, on the left ear, on the right shoulder, with a new table drawn up for every half month. These Ramesside star clocks replaced risings with transits, an exacter observation, though the decans themselves remained the reference stars.

Gods who needed appeasing

In the first millennium BCE the decans took on a second life as powers in their own right. Late Period temples carve them as snake-headed and lion-headed figures; they appear on water clocks, healing statues and amulets. They were understood as emissaries of Sekhmet, the lion goddess of plague, capable of loosing disease upon the year or holding it back, and the five added days outside the decan count were especially dangerous and needed protective spells. This is the point where the decans stop being only a clock and become beings with names, images and tempers, and it is this Egypt, not the timekeepers' Egypt, that the later magical tradition inherited.

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From stars to faces

When the Babylonian zodiac reached Egypt under the Ptolemies, the two systems fused. The round zodiac carved at Dendera around 50 BCE shows the moment in stone: the twelve signs in the middle of the sky, the thirty-six decans running around the rim. Hellenistic astrologers made the fusion arithmetical, cutting each sign into three faces of ten degrees and setting one decan over each. A planetary ruler was assigned to every face in the descending Chaldean order, Mars taking the first face of Aries, the Sun the second, Venus the third, and so on through all thirty-six. Under the names Nechepso and Petosiris, a pseudonymous corpus gave the scheme Egypt's prestige, and Teucer of Babylon, writing from the fortress town near modern Cairo, catalogued the images that rise with each decan. The decan had become a subdivision of the zodiac sign, the form in which astrologers still use it.

Medicine, gems and spirits

The Greco-Egyptian centuries put the decans to work on the body. The Sacred Book of Hermes to Asclepius assigns each decan a zone of the body, from head to feet in zodiacal order, together with a stone and a plant; engrave the decan's image on its stone, set the plant beneath, and the amulet guards the organ its decan rules. The Testament of Solomon, a Greek text of the early centuries CE, dramatizes the same doctrine: thirty-six spirits of the decans file past King Solomon, each confessing which ailment it causes, headache, sore throat, marital strife, and which angelic name drives it out. Firmicus Maternus, writing his Mathesis in the fourth century, still treats the decans as potent gods within the signs and alludes to finer spirits, the munifices, beneath them. In this strand the decans are hardly astrology at all; they are a system of diagnosis and protection.

The long road west

After the temples closed, the decans survived by translation. Abu Ma'shar of Balkh, working in ninth-century Baghdad, set out three complete image sets for every decan, the Persian, the Indian and the Greek, in his Great Introduction, and the Picatrix, a magician's compendium from al-Andalus, turned the images into talisman recipes. Latin translations in the twelfth and thirteenth centuries carried both books into Europe. Around 1470 the decans surfaced, unrecognized, in the Salone dei Mesi of the Palazzo Schifanoia in Ferrara, where three enigmatic figures preside over each month; in 1912 the art historian Aby Warburg identified them as the decans and traced their route from Egypt through Abu Ma'shar to the fresco painters, a discovery that helped found the modern study of the tradition. Agrippa's Three Books of Occult Philosophy, printed in 1533, gave the faces and their images to every reader of learned magic, and from Agrippa the line runs unbroken to the occult revival of the nineteenth century.

The decans in the tarot

The Hermetic Order of the Golden Dawn, founded in London in 1888, bolted the decans directly onto the tarot. Their scheme assigns each numbered minor card from Two to Ten to one decan: the suit gives the element and therefore the zodiacal triplicity, the number gives the position, and the decan's planetary ruler colours the card. The Five of Cups is Mars in the first decan of Scorpio; the Ten of Pentacles is Mercury in the third decan of Virgo. Waite and Smith built the Rider-Waite deck inside this framework, and Crowley printed the decan attributions on the cards of the Thoth deck outright. Anyone who reads the thirty-six pip cards with these decks is, knowingly or not, handling the last working descendant of the Egyptian star clock.

What we actually know

Modern knowledge of the decans rests on a small shelf of scholarship: Wilhelm Gundel's Dekane und Dekansternbilder of 1936 collected the names, images and texts across four languages, and Otto Neugebauer and Richard Parker's three-volume Egyptian Astronomical Texts of 1960 to 1969 edited the coffin lids, ceilings and star clocks themselves. One humbling result deserves notice: apart from Sirius and the stars of Orion, which belonged to the decans Sopdet and Sah, almost none of the thirty-six can be identified with certainty in the modern sky. The lists survive, the images survive, the ten-day rhythm survives, but the stars themselves have slipped their names. The decans reach the present as a structure, thirty-six divisions of the year and the zodiac, rather than as a star map.

How to read this section

The chapter cards above follow one idea through four thousand years, from the coffin lids of Asyut to the pip cards of a modern deck, and the figures below mark the hands it passed through. Read the early chapters for the astronomy, the middle ones for the magic, and the late ones for the routes by which Egypt's star clock reached Europe. The decans, their history and their uses are available in the fifty-two languages of the Tarot Academy ecosystem.

Frequently asked questions

: Thirty-six stars and star groups that rise one after another along the eastern horizon through the Egyptian year, a new one taking over roughly every ten days. The Egyptians used their risings to tell the hours of the night and to structure the calendar into ten-day weeks. The Greeks later called them dekanoi, the tens, and folded them into the zodiac as subdivisions of the signs.
: About a dozen decans rise between dusk and dawn on any given night, so each rising marked off one hour. The diagonal star tables painted inside coffin lids around 2100 BCE tabulate which decan marks which hour for every ten-day week of the year. Because each star rises about four minutes earlier per night, the names shift one row every week or so, producing the diagonal pattern the tables are named for.
: The number falls out of the calendar. The Egyptian civil year had 360 days in twelve months of thirty days, plus five feast days outside the count. Divided into ten-day weeks, that gives thirty-six weeks, and one decan was assigned to each as its marker star. The fit with the later zodiac is equally neat: thirty-six decans of ten degrees each fill the 360-degree circle, three to a sign.
: Sirius vanishes into the sun's glare for about seventy days each year at Egypt's latitude, and its heliacal rising is the first morning it reappears in the dawn sky. That morning marked the Egyptian New Year and arrived close to the start of the Nile flood, on which the whole agricultural year depended. The star was worshipped as Sopdet, and its seventy hidden days set the traditional length of mummification.
: Yes, in origin. The Egyptians divided the night into twelve hours marked by decan risings and the day into twelve hours measured by shadow clocks, giving twenty-four in all. Their hours changed length with the seasons; Greek astronomers in Alexandria kept the count of twenty-four but made the units equal for calculation. The count itself, twelve and twelve, comes from the decans.
: Mostly unknown. Sirius was the decan Sopdet, and the stars of Orion formed Sah, but beyond these two anchors nearly all proposed identifications remain conjecture. The lists give names and images, not coordinates, and the observing rules behind them are reconstructed from the tables themselves. Neugebauer and Parker, who edited the sources, concluded that certainty is out of reach for most of the thirty-six.
: Subdivisions of the zodiac signs. Each sign is cut into three segments of ten degrees, and each segment, called a decan or face, has its own planetary ruler. The classical scheme assigns rulers in the descending Chaldean order beginning with Mars in the first decan of Aries; a rival scheme popular in newspaper astrology assigns them by triplicity. Astrologers use decans to shade the meaning of a planet's position within its sign.
: Through the Golden Dawn's attributions, worked out in London from 1888. Each numbered minor card from Two to Ten is assigned to one of the thirty-six decans, with the suit fixing the element and the card's number fixing the segment, so the Five of Cups is Mars in the first decan of Scorpio. The Rider-Waite deck was designed inside this scheme and the Thoth deck prints it on the cards, so decan symbolism underlies most modern pip readings.
: A circular sky map carved around 50 BCE on a chapel ceiling of the temple of Hathor at Dendera, and now in the Louvre. It shows the twelve Babylonian zodiac signs surrounded by the thirty-six Egyptian decans around the rim, with planets and eclipses placed among them. It is the clearest surviving picture of the moment the native decan calendar and the imported zodiac merged into one system.
: Extensively. Late Egyptian temples treated the decans as emissaries of Sekhmet who could send or avert plague, and Greco-Egyptian handbooks assigned each decan a body part, a stone and a plant, so that an engraved gem could protect the organ its decan ruled. The Testament of Solomon lists thirty-six decan spirits with the ailments they cause, and the Picatrix and Agrippa carried the talisman images into European magic.

All astrological traditions

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Tarot kartlarının qədim hikmətini kəşf edin və ruhani səyahətinizin sirrlərini açın. Blogumuz, tarot oxumağın zəngin simvolizmini, mənalarını və praktiki tətbiqlərini anlamaq üçün qapınızdır.

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