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'Diagonal star table' from the late 11th Dynasty coffin lid; found at Asyut, Egypt. Roemer- und Pelizaeus-Museum Hildesheim

The Decans /ˈdɛkənz/ (Egyptian bakiu) are 36 groups of stars (small constellations) which rise consecutively on the horizon throughout each earth rotation. The rising of each decan marked the beginning of a new decanal "hour" (Greek hōra) of the night for the ancient Egyptians, and they were used as a sidereal star clock beginning by at least the 9th or 10th Dynasty (ca 2100 BCE.)

Because a new decan also appears heliacally every ten days (that is, every ten days, a new decanic star group reappears in the eastern sky at dawn right before the Sun rises, after a period of being obscured by the Sun's light), the ancient Greeks called them dekanoi (pl. of dekanos) or "tenths" (and when the concept of decans reached northern India, they were called drekkana in Sanskrit.)

Decans continued to be used throughout the Renaissance in astrology and in magic, but modern astrologers almost entirely ignore them.

Ancient Egyptian origins[edit]

Astronomical ceiling of Senemut Tomb showing various decans, as well as the personified representations of stars and constellations

Decans first appeared in the 10th Dynasty (2100 BCE) on coffin lids. The sequence of these star patterns began with Sothis/Sirius, and each decan contained a set of stars and corresponding divinities. As measures of time, the rising and setting of decans marked 'hours' and groups of 10 days which comprised an Egyptian year. The ancient Book of Nut, covers the subject of the decans.

There were 36[1] decans (36 X 10 = 360 days), plus 5 added days to compose the 365 days of a solar based year. Decans measure sidereal time and the solar year is 6 hours longer; the Sothic and solar years in the Egyptian calendar realign every 1460 years. Decans represented on coffins from later dynasties (such as King Seti I) compared with earlier decan images demonstrate the Sothic-solar shift.

According to Sarah Symons,

Although we know the names of the decans, and in some cases can translate the names (Hry-ib wiA means ‘in the centre of the boat’) the locations of the decanal stars and their relationships to modern star names and constellations are not known. This is due to many factors, but key problems are the uncertainty surrounding the observation methods used to develop and populate the diagonal star tables, and the criteria used to select decans (brightness, position, relationship with other stars, and so on).[2]

Later developments[edit]

These predictable heliacal re-appearances by the decans were eventually used by the Egyptians to mark the divisions of their annual solar calendar. Thus the heliacal rising of Sirius marked the annual flooding of the Nile.

Eventually this system led to a system of 12 daytime hours and 12 nighttime hours, varying in length according to the season. Later, a system of 24 "equinoctial" hours was used.[3]

After astrology was introduced to Egypt, various systems attributing astrological significance to decans arose. Decans were connected, for example, with various diseases and with the timing for the engraving of talismans for curing them;[4] with decanic "faces" (or "phases"), a system where three decans are assigned to each zodiacal sign, each covering 10° of the zodiac, and each ruled by a planetary ruler (see below); and correlated with astrological signs.[5]

Descriptions of the Decans[edit]

Decans are named in various Greco-Egyptian sources, many Hermetic writings, the Testament of Solomon,[6] and the writings of Aristobulus of Paneas.[7] Julius Firmicus Maternus, Cosmas of Maiuma, Joseph Justus Scaliger, and Athanasius Kircher.[6]

Images of the decans are described in Hermetic writings, by the Indian astrologer Varāhamihira, in the Picatrix, and in Japanese writings.[8] Varāhamihira's images of the decans was influenced by Greco-Egyptian, if not Hermetic, depictions of the decans by way of the Yavanajataka, .[9] Their role in Japanese astrology may have derived from an earlier Chinese[10] or Indian form[11] possibly from adding the twelve animals of the Chinese zodiac to a list of twenty-four hour stars.[10] They were most common between the Kamakura and Edo periods.[11]

Names of the Decans
Western Zodiac Decan Greco-Egyptian[6] Testament of Solomon[6][12][13] Aristobulus's names[7] Greek Hermeticism[14][6][15] Latin Hermeticism[16][6][15] Firmicus[6] Cosmas[6][17] Scalinger[6] Kircher[6] East Asian zodiac[18] East Asian animals[18]
Aries 1 Χont-har Rhyax or Ruax Bendonc Chenlachori Aulathamas Senator or Asiccan Aidoneus Asiccan Arueris Rat Cat (, see Bakeneko)
2 Si-ket Barsafael Mensour Chontaret Sabaoth Senacher or Asenter Persephone Senacher Anubis Rat ()
3 Xont-χre Artosael or Arôtosael Carexon Siket Disornafais Sentacher or Asentacer Eros Acentacer Horus Bat (伏翼)
Taurus 4 Xau Horopel Gisan Soou Jaus Suo or Asicat Charis Asicath Serapis Ox Cattle ()
5 Arat Kairoxanondalon or Iudal Tourtour Aron Sarnotois Aryo or Ason die Horen Viroaso Helitomenos Crab ()
6 Remen-hare Sphendonael Ballat Rhomenos Erchmubris Romanae or Arfa Litai Aharph Apopis Turtle ()
Gemini 7 Θosalk Sphandor Farsan Xocha Manuchos Thesogar or Tensogar Thetys Thesogar Tautus Tiger Raccoon dog (, see Tanuki)
8 Uaret Belbel Vaspan Ouari Samurois Ver or Asuae Kybele Verasua Cyclops Leopard ()
9 Phu-hor Kourtael or Kurtaêl Parquia Pepisoth Azuel Tepis or Atosoae Praxidike Tepisatosoa Titan Tiger ()
Cancer 10 Sopdet Metathiax Panem Sotheir Seneptois Sothis or Socius Nike Sothis Apollun Rabbit Fox (, see Huli Jing and Kitsune)
11 Seta Katanikotael Catarno Ouphisit Somachalmais Sith Herakles Syth Hecate Rabbit ()
12 Knum Saphthorael or Saphathoraél Hellors Chnouphos Charmine Thiumis or Thumus Hekate Thuimis Mercophta Badger (, see Mujina)
Leo 13 Χar-Knum Phobothel or Bobêl Jarea Chnoumos Zaloias Craumonis or Afruicois Hephaistos Aphruimis Typhon Dragon Dragon ()
14 Ha-tet Leroel or Kumeatêl Effraa Ipi Zachor Sic Isis Sithacer Peroeus Shark ()
15 Phu-Tet Roeled Hayas Phatiti Frich Futile or Eisie Sarapis Phuonisie Nepenthe Fish ()
Virgo 16 Tom Katrax or Atrax Angaf Athoum Zamendres Thumis or Thinnis Themis Thumi Isis Snake Cicada ()
17 Uste-bikot Jeropa or Ieropaêl Bethapen Brysous Magois Tophicus or Tropicus Moirai Thopitus Piosiris Carp ()
18 Aposot Modobel or Buldumêch Baroche Amphatham Michulais Afut or Asuth Hestia Aphut Cronus Snake ()
Libra 19 Sob‿χos Madero or Naôth Zercuris Sphoukou Psineus Seuichut or Senichut Erinys Serucuth Zeuda Horse Deer (鹿)
20 Tpa-χont Nathotho or Marderô Baham Nephthimes Chusthisis Sepisent or Atebenus Kairos Aterechinis Omphta Horse ()
21 Xont-har Alath Pieret Phou Psamiatois Senta or Atepiten Loimos Arpien Ophionius Roebuck ()
Scorpio 22 Spt-χne Audameoth Haziza Name Necbeuos Sentacer or Asente Nymphs Sentacer Arimanius Goat Sheep ()
23 Sesme Nefthada Nacy Oustichos Turmantis Tepsisen or Asentatir Leto Tepiseuth Merota Goose ()
24 Si-sesme Akton Alleinac Aphebis Psermes Sentineu or Aterceni(-cem) Kairos (repeated) Senicer Panotragus Hawk or falcon ()
Sagittarius 25 Hre-ua Anatreth Ortusa Sebos Clinothois Eregbuo or Ergbuo Loimos (repeated) Eregbuo Tolmophta Monkey Gibbon (, see "You")[19][20]
26 Sesme Enautha or Enenuth Daha Teuchmos Thursois Sagon Kore Sagen Tomras Ape (, see "Yuan")[20]
27 Konime Axesbyth or Phêth Satan Chthisar Renethis Chenene or Chenem Ananke Chenen Teraph Monkey (, see "Hou")[20]
Capricorn 28 Smat Hapax or Harpax Eracto Tair Renpsois Themeso Asklepios Themeso Soda Rooster Raven ()
29 Srat Anoster Salac Epitek Manethois Epiemu or Epimen Hygieia Epima Riruphta Chicken ()
30 Si-srat Physikoreth or Alleborith Seros Epichnaus Marcois Omot Tolma Homoth Monuphta Pheasant ()
Aquarius 31 Tpa-χu Aleureth or Hephesimireth Tonghel Isi Ularis Oro or Asoer Dike Oroasoer Brondeus Dog Dog (, see Inugami)
32 Xu Ichthion Anafa Sosomo Luxois Cratero or Astiro Phobos Astiro Vucula Wolf ()
33 Tpa-Biu Achoneoth or Agchoniôn Simos Chonoumous Crauxes Tepis or Amasiero Osiris Tepisatras Proteus Ch. Dhole, Ja. Honshu wolf ()
Pisces 34 Biu Autoth or Autothith Achaf Tetimo Fambais Acha or Atapiac Okeanos Archatapias Rephan Pig Pig ()
35 Xont-Har Phtheneoth or Phthenoth Larvata Sopphi Flugmois Tepibui or Tepabiu Dolos Thopibui Sourut Domestic pig ( )
36 Tpi-biu Bianakith Ajaras Syro Piatris Uiu or Aatexbui Elpis Atembui Phallophorus Wild boar (, Gundel gives Swallow)

Table of Faces (or Decanates)[edit]

There were two main versions of rulership given to the decans in the ancient world: Chaldean rulership and rulership by Triplicity.

"The Faces of the Planets" * (Lilly)[21]
Sign First Decan ruler

(0 - 9.999 deg.)

Second Decan ruler

(10 - 19.999 deg.)

Third Decan ruler

(20 - 29.999 deg.)

Aries Mars Sun Venus
Taurus Mercury Moon Saturn
Gemini Jupiter Mars Sun
Cancer Venus Mercury Moon
Leo Saturn Jupiter Mars
Virgo Sun Mercury Venus
Libra Moon Saturn Jupiter
Scorpio Mars Sun Venus
Sagittarius Mercury Moon Saturn
Capricorn Jupiter Mars Sun
Aquarius Venus Mercury Moon
Pisces Saturn Jupiter Mars

* as used as an essential dignity in astrology.

Notice that rulerships follow a repeating pattern, the so-called "Chaldean" order of the planets: Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon. This planetary order, in which the Sun stands at the center of the continuum, with the planets between the Sun and the Earth on one side and the outer planets on the other side, reflected the perception of the speed of each planet's motion as seen from the Earth.

"The Faces of the Planets" * (Triplicity)
Sign First Decan ruler

(0 - 9.999 deg.)

Second Decan ruler

(10 - 19.999 deg.)

Third Decan ruler

(20 - 29.999 deg.)

Aries Mars Sun Jupiter
Taurus Venus Mercury Saturn
Gemini Mercury Venus Saturn
Cancer Moon Mars Jupiter
Leo Sun Jupiter Mars
Virgo Mercury Saturn Venus
Libra Venus Saturn Mercury
Scorpio Mars Jupiter Moon
Sagittarius Jupiter Mars Sun
Capricorn Saturn Venus Mercury
Aquarius Saturn Mercury Venus
Pisces Jupiter Moon Mars

Decans or "faces" are the least important of the essential dignities, representing about one-fifteenth of a planet's overall strength in medieval astrology.

Ancient India[edit]

In India, the division of the zodiac into 36 ten degree portions is called either the drekkana (drekkāṇa),the dreshkana (dreṣkāṇa), or the drikana (dṛkāṇa).[22]

The iconography and use of the drekkana’s is mention earliest by Sphujidhvaja in Yavanajataka (269-70 CE), and given detailed treatment by Varahamihira in his Brihat-Samhita (550 CE). Modern scholars believe the decans were imported into India through the Greeks, who learned about them from the Egyptians.[23]

There are multiple types of drekkana in use in Indian astrology. The parivritti drekkana goes in order of the signs; the first decan is Aries, the second is Taurus, the third is Gemini, the fourth is Cancer, etc. Then there is the trinal calculation which utilizes the elemental trines to each sign; In Aries there is Aries, Leo, and Sagittarius, while in Taurus there is Taurus, Virgo, and Capricorn. There are in total four variations of drekkana calculations. Indian astrologers will calculate these signs (varga) and create a new chart based upon the sign placement for predictive purposes.

See also[edit]


  1. ^ von Bomhard, Dr. A. S., The Egyptian Calendar a Work for Eternity, London 1999, page 51
  2. ^ Sarah Symons, A Star’s Year: The Annual Cycle in the Ancient Egyptian Sky - University of Leicester
  3. ^ Neugebauer, Otto (1983) [1955]. "The Egyptian "Decans"". Astronomy and History: Selected Essays. New York: Springer. pp. 205–209. doi:10.1007/978-1-4612-5559-8. ISBN 978-0-387-90844-1.  Neugebauer, Otto (1969) [1957]. The Exact Sciences in Antiquity (2 ed.). Dover Publications. pp. 81–88. ISBN 978-0-486-22332-2. 
  4. ^ see for example, RUELLE, C. E., Hermès Trismégiste, Le livre sacré sur les décans. Texte, variantes et traduction française, Revue de philologie, de littérature et d'histoire anciennes, n.s.:32:4 (1908:oct.) p .247
  5. ^ Julius Firmicus Maternus, Matheseos IV/22.
  6. ^ a b c d e f g h i j Dekane und Dekansterbilder by Wilhelm Gundel, pub. J.J. Augustin, Glückstadt und Hamburg, 1936, p.77-81
  7. ^ a b Gundel, p. 406-408
  8. ^ Gundel, p.223-225
  9. ^ "The Indian Iconography of the Decans and Horâs" by David Pingree, Journal of the Warburg and Courtauld Institutes, vol. 26, no. 3/4 (1963), p. 223-254
  10. ^ a b Gundel, p. 217-221
  11. ^ a b "Bukkyō tenbugaku-senseijutsu no zuzō gakuteki junmen: sanjū rokkin to Dekan" by Yano Michio, Dōshisha daigaku rikō kenkyū hōkoku, 48, no 4 (2008), 1-6.
  12. ^ Gundel, p.49-62
  13. ^ The Testament of Solomon, translated by Frederick Cornwallis Conybeare, Jewish Quarterly Review, October, 1898. Ed. Joseph Peterson, 1997, Esoteric Archives
  14. ^ "Hermès Trismégiste: Le Livré Sacre sur les Décans: Texte, variantes et traduction française" by C.E. Ruelle, Revue de Philologie October 1908, p.247-277
  15. ^ a b Gundel, p.374-383
  16. ^ "Hermes Trismegistus: Liber Hermetis, Book I" trans. Robert Zoller, ed. Robert Hand, p.iii-12
  17. ^ Gundel, p.353-354
  18. ^ a b 三十六禽 (Thirty-Six Animals) in the Buddhist Dictionary hosted by Buddhistdoor International
  19. ^ The gibbon in China: an essay in Chinese animal lore by Robert van Gulik, Brill Publishers, 1967, p.31
  20. ^ a b c Bencao Gangmu: Compendium of Materia Medica, tr. Luo Xiwen, Foreign Languages Press, 2003, p.4124
  21. ^ William Lilly, Christian Astrology (London, 1647), pp. 104, 105.
  22. ^ Monier Williams Sanskrit Dictionary
  23. ^ Pingree, David (1963). "The Indian Iconography of the Decans and Horas". Journal of the Warburg and Courtauld Institutes 26 (3/4): 223–254. doi:10.2307/750493 – via JSTOR. (registration required (help)). 

Further reading[edit]

  • Symons, Sarah (2014). "Egyptian “Star Clocks”". In Ruggles, Clive L.N. Handbook of Archaeoastronomy and Ethnoastronomy. New York: Springer. pp. 1495–1500. ISBN 978-1-4614-6140-1. 
  • van der Waerden, B. L. (January 1949). "Babylonian Astronomy. II. The Thirty-Six Stars". Journal of Near Eastern Studies 8 (1): 6–26 – via JSTOR. (registration required (help)). The property of the Chaldean Decans that one of them rose every ten days made them fit to be assimilated to the Egyptian decans. This assimilation was performed in the decan lists of Hellenistic astrology. 

External links[edit]

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Decans — Please support Wikipedia.
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