The Seven-Day Week

Astrological Planets
ordered by period (days)
10761
4332
687
365
224
88
29
Saturn
Jupiter
Mars
Sun
Venus
Mercury
Moon
Using this sequence, assign each hour of the day to the care of one of the planets. Carry the remainder forward to the first hours of the next day. Assign each day to the care of its first hour's planet.

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  Saturn Sun Moon Mars Mercury Jupiter Venus
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Saturn
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Sun
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Mercury
Moon
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Mars
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Mercury
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Mercury
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Jupiter
Mars
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Venus
Mercury
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Jupiter
Mars
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Venus
Mercury
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Jupiter
Mars
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Venus
Mercury
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Jupiter
Mars
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Mercury
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Jupiter
Mars
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Venus
Mercury
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Saturn
Jupiter
Mars
Sun
Venus
Mercury
Moon
Saturn
Jupiter
Mars
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Venus
Mercury
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Saturn
Jupiter
Mars
Sun
Venus
Mercury
Moon
Saturn
Jupiter
Mars
Sun
Venus
Mercury
Moon
Saturn
Jupiter
Mars
Sun
Venus
Mercury
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Saturn
Jupiter
Mars
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Mercury
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Mars
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Venus
Mercury
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Mars
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Mercury
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Saturn
Jupiter
Mars
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Mars
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Languages Saturn Sun Moon Mars Mercury Jupiter Venus
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Saturday
Samedi
Samstag
zaterdag
Sabado
Sábado
Sabato
Subbota
lördag
Doyou
Shabat
pó`aono
Khronu
Saturni
Saterne's
Szombat
Sobota
sobota
Simbata
laupäev
Lauantai
lørdag
Lørdag
Laugardagur
subota
subota
Cumartesi
Shoni
Saterdag
Sabato
Sunday
Dimanche
Sonntag
zondag
Domingo
Domingo
Domenica
Voskresenie
söndag
Nichiyou
Yom rishon
pópule
heliou
Solis
Sun's
Vasárnap
Niedziela
nede^le
Duminica
pühapäev
Sunnuntai
søndag
Søndag
Sunnudagur
nedjelja
nedjelja
Pazar
Robi
Sondag
Diman^co
Monday
Lundi
Montag
maandag
Lunes
Segunda
Lunedí
Ponedelnik
måndag
Getzuyou
Yom sheni
pó`akahi
selenes
Lunae
Moon's
Hétfö
Poniedzial/ek
ponde^lí
Luni
esmaspäev
Maanantai
mandag
Mandag
Mánudagur
ponedjeljak
ponedjeljak
Pazartesi
Shom
Maandag
Lundo
Tuesday
Mardi
Dienstag
dinsdag
Martes
Terça
Martedí
Vtornik
tisdag
Kayou
Yom shlishi
pó`alua
Areos
Martis
Tiw's
Kedd
Wtorek
úterý
Marti
teisipäev
Tiistai
tirsdag
Tirsdag
þriðjudagur
utorak
utorak
Sall
Mongal
Dinsdag
Mardo
Wednesday
Mercredi
Mittwoch
woensdag
Miércoles
Quarta
Mercoledí
Sreda
onsdag
Suiyou
Yom Revi'i
pó`akolu
Hermu
Mercurii
Woden's
Szerda
S,roda
str^eda
Miercuri
kolmapäev
Keskiviikko
onsdag
Onsdag
Miðvikudagar
srijeda
sreda
Çar,samba
Budhh
Woensdag
Merkredo
Thursday
Jeudi
Donnerstag
donderdag
Jueves
Quinta
Giovedí
Chetverg
torsdag
Mokuyou
Yom chamishi
pó`ahá
Dios
Jovis
Thor's
Csütörtök
Czwartek
c^tvrtek
Joi
neljapäev
Torstai
torsdag
Torsdag
Fimmtudagur
cxetvrtak
cxetvrtak
Per,sembe
BRihashpati
Donderdag
^Jaùdo
Friday
Vendredi
Freitag
vrijdag
Viernes
Sexta
Venerdí
Pyatnitsa
fredag
Kin'you
Yom shishi
pó`alima
Aphrodites
Veneris
Frigg's
Péntek
Pia,tek
pátek
Vineri
reede
Perjantai
fredag
Fredag
Föstudagur
petak
petak
Cuma
Shukro
Vrydag
Vendredo
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WEEK   [formerly in the Web's Global Encyclopedia, now defunct]

Next to the day, the week is the most important calendric unit in our life. And yet, there is no astronomical significance to the week. Nothing cosmic happens in the heavens in seven days.* How, then, did the week come to assume such importance?

The first thing to understand is that a week is not necessarily seven days. In pre-literate societies weeks of 4 to 10 days were observed; those weeks were typically the interval from one market day to the next. Four to 10 days gave farmers enough time to accumulate and transport goods to sell. (The one week that was almost always avoided was the 7-day week -- it was considered unlucky!) The 7-day week was introduced in Rome (where ides, nones, and calends were the vogue) in the first century A.D. by Persian astrology fanatics, not by Christians or Jews. The idea was that there would be a day for the five known planets, plus the sun and the moon, making seven; this was an ancient West Asian idea. However, when Christianity became the official religion of the Roman empire in the time of Constantine (c. 325 A.D.), the familiar Hebrew-Christian week of 7 days, beginning on Sunday, became conflated with the pagan week and took its place in the Julian calendar. Thereafter, it seemed to Christians that the week Rome now observed was seamless with the 7-day week of the Bible -- even though its pagan roots were obvious in the names of the days: Saturn's day, Sun's day, Moon's day. The other days take their equally pagan names in English from a detour into Norse mythology: Tiw's day, Woden's day, Thor's day, and Fria's day.

The amazing thing is that today the 7-day week, which is widely viewed as being Judeo-Christian, even Bible-based, holds sway for civil purposes over the entire world, including countries where Judaism and Christianity are anathema. Chinese, Arabs, Indians, Africans, Japanese, and a hundred others sit down at the U.N. to the tune of a 7-day week, in perfect peace (at least calendrically!). So dear is this succession of 7 days that when the calendar changed from Julian to Gregorian the week was preserved, though not the days of the month: in 1752, in England, Sept. 14 followed Sept. 2 -- but Thursday followed Wednesday, as always. Eleven days disappeared from the calendar -- but not from the week!

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*Yes, it's true that the average time from, say, half-moon to full moon is 7.383 days, but this is less than 12% closer to 7 than to 8. (Possibly mindful of this, the Romans had an 8-day week.) In any case, the exact moment of half or full moon is hard to judge. The moon determines the month, not the week (the very word "month" has been related to "moon" for thousands of years; in Sanskrit they are the same.)

- Vincent Mallette vmallette@inwit.com