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==External links==
* [http://www.englatheod.org/calendar.htm Englisc Rímbóc: The Anglo-Saxon Calendar]{{Dead link|date=December 2014}}
*{{Cite EB1911|wstitle=week}}
*{{Cite EB1911|wstitle=week}}

* [http://www.economist.com/node/895542?fsrc=scn/fb/wl/ar/thepowerofseven The power of seven], The Economist, 20 December 2001.


{{Time topics}}
{{Time topics}}

Revision as of 06:58, 8 April 2015

For other uses, see Week (disambiguation) and Weeks (disambiguation).
An Italian cameo bracelet representing the days of the week by their eponymous deities (mid-19th century, Walters Art Museum)

A week is a

time unit equal to seven days. It is the standard time period used for cycles of work days and rest days in most parts of the world, mostly alongside (but not strictly part of) the Gregorian calendar
.

The days of the week

classical planets (derived from the astrological system of planetary hours), in English reflected in the names of Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday
.

ISO 8601 includes the ISO week date system, a numbering system for weeks within a given year – each week begins on a Monday and is associated with the year that contains that week's Thursday (so that if a year starts in a long weekend Friday–Sunday, week number one of the year will start after that).

The term "week" is sometimes expanded to refer to other time units comprising a few days, such as the

nundinal cycle
of the ancient Roman calendar.

Definition and duration

A week is defined as an interval of exactly seven days, so that technically, except at

leap seconds
,

1 week = 7 days = 168 hours = 10,080 minutes = 604,800 seconds.

With respect to the Gregorian calendar:

  • 1 Gregorian calendar year = 52 weeks + 1 day (2 days in a leap year)
  • 1 week = 1600⁄6957 ≈ 22.9984% of an average Gregorian month

In a

Julian year
of 365.25 days or 52+5⁄28 ≈ 52.1786 weeks, which cannot be represented by a finite decimal expansion). There are exactly 20871 weeks in 400 Gregorian years, so 30 April 1611 was a Saturday just like 30 April 2011. A system of Dominical letters has been used to determine the day of week in the Gregorian or the Julian calendar.

Relative to the path of the

lunation
, or 94.637% of an average quarter lunation. In antiquity, days were measured either from sunset to sunset, or from sunrise to sunrise, so that the length of the week (and the day) would be subject to slight variations depending on the time of year and the observer's geographical latitude.

Adding 1 to the modulus 7 of a date's

Julian day number yields that date's ISO 8601 day of the week,[1]

1 2 3 4 5 6 7
Monday Tuesday Wednesday Thursday Friday Saturday Sunday

For example, the Julian day number of 24 June 2024 is 2460486. Calculating (2460486 mod 7 + 1) yields 1, corresonding to Template:CURRENTWEEKDAYNAME.

Name

The English word

Common Germanic *wikōn-, from a root *wik- "turn, move, change". The Germanic word probably had a wider meaning prior to the adoption of the Roman calendar, perhaps "succession series", as suggested by Gothic wikō translating taxis "order" in Luke
1:8.

The seven-day week is named in many languages by a word derived from "seven", such as the Latin septimana and its derivates in Romance languages. In English there is the archaic term sennight (also sennight or se'night), an abbreviation of "seven-night" (comparable in structure to the word "fortnight"), still in use in the early 19th century, to judge from Jane Austen's letters.

Days of the week

Main article:
Days of the week
Schematic comparison of the ordering of the classical planets (arranged in a circle) and the sequence of days in the week (forming a heptagram within the circle).

The days of the week were originally named for the

Day of the Lord) as the first day. The Greco-Roman gods associated with the classical planets were rendered in their interpretatio germanica
at some point during the late Roman Empire, yielding the Germanic tradition of names based on indigenous deities.

The ordering of the weekday names are not that of the classical order of the planets (sorted by distance in the

planetary spheres
model, or, equivalently, by their apparent speed of movement in the night sky). Instead, the planetary hours systems resulted in succeeding days being named for planets which are three places apart in their traditional listing. This characteristic was apparently discussed in Plutarch in a treatise written in c. AD 100 which is reported to have addressed the question of Why are the days named after the planets reckoned in a different order from the actual order? (the text of Plutarch's treatise has been lost).[2]

Sunday Monday Tuesday Wednesday Thursday Friday Saturday
planet: Sun
Moon
Mars
Mercury
Jupiter
Venus
Saturn
Greco-Roman deity Helios-Sol Selene-Luna Ares-Mars Hermes-Mercury
Jupiter
 Aphrodite-Venus Cronus-Saturn
Greek: ἡμέρα Ἡλίου
/iméra ilíu/ 		ἡμέρα Σελήνης
/iméra selínis/ 		ἡμέρα Ἄρεως
/iméra áreos/ 		ἡμέρα Ἑρμοῦ
/iméra ermû/ 		ἡμέρα Διός
/iméra diós/ 		ἡμέρα Ἀφροδίτης
/iméra afrodítis/ 		ἡμέρα Κρόνου
/iméra krónu/
Latin: dies Sōlis dies Lūnae dies Martis dies Mercuriī dies Iovis dies Veneris dies Saturnī
interpretatio germanica
Sun
 Moon
Tiwaz
Wodanaz
Þunraz
Frige
 —
Old English sunnandæg mōnandæg tiwesdæg wōdnesdæg þunresdæg frīgedæg sæterndæg

An ecclesiastical, non-astrological, system of numbering the days of the week was adopted in Late Antiquity. This model also seems to have influenced (presumably via Gothic) the designation of Wednesday as "mid-week" in Old High German (mittawehha) and Old Church Slavonic (срѣда). Old Chruch Slavonic may also modelled the name of Monday, понєдѣльникъ, after the Latin feria secunda.[3] The ecclesiastical system became prevalent in

Galician-Portuguese.[4]

1.
Day of the Lord
)		 2. Monday 3. Tuesday 4. Wednesday 5. Thursday 6. Friday 7. Saturday (Sabbath)
Greek
 Κυριακὴ ἡμέρα
/kiriaki iméra/ 		Δευτέρα ἡμέρα
/devtéra iméra/ 		Τρίτη ἡμέρα
/tríti iméra/ 		Τετάρτη ἡμέρα
/tetárti iméra/ 		Πέμπτη ἡμέρα
/pémpti iméra/ 		Παρασκευὴ ἡμέρα
/paraskevi iméra/[5] 		Σάββατον
/sáb:aton/
Latin [dies] dominica; rarely feria prima, feria dominica feria secunda feria tertia feria quarta; rarely media septimana feria quinta feria sexta Sabbatum; dies sabbatinus, dies Sabbati,; rarely feria septima, feria Sabbati

History

While the seven-day cycle may have deep historical origins in the

horoscopy is a development of Babylonian astrology roughly around 500 BC, with the oldest extant horoscope dated to just before 400 BC.[6]

The seven-day week being approximately a quarter of a lunation has been proposed (e.g. by Friedrich Delitzsch) as the implicit, astronomical origin of the seven-day week,[7] and indeed the Babylonian calendar used intercalary days to synchronize the last week of a month with the new moon.[8]

The seven-day week seems to have been adopted (independently) by the

Tang China.[9]
The Babylonian system was received by the Greeks in the 4th century BC (notably via Eudoxus of Cnidus). But the designation of the seven days of the week to the seven planets does not seem to have any Babylonian precedent[10] and is rather an original innovation of Hellenistic astrology, probably first conceived in the 2nd century BC.[6] It was widely known throughout the
nundinal cycle
during the 4th century.

Ancient Near East

The earliest evidence of an astrological significance of a seven-day period is connected to

Gutian dynasty, who built a seven-room temple, which he dedicated with a seven-day festival. In the flood story of the Assyro-Babylonian epic of Gilgamesh the storm lasts for seven days, the dove is sent out after seven days, and the Noah-like character of Utnapishtim leaves the ark seven days after it reaches firm ground.[11]

It seems likely that the Hebrew seven-day week is based on the Babylonian tradition, although going through certain adaptations.

Enuma Elish
, is recorded on seven tablets. [12]

Babylonians[year needed] celebrated a holy day every seven days, starting from the new moon, then the first visible crescent of the Moon, but adjusted the number of days of the final "week" in each month so that months would continue to commence on the new moon.[citation needed]

Counting from the new moon, the Babylonians celebrated the 7th, 14th, 21st, and 28th as "holy-days", also called "evil days" (meaning "unsuitable" for prohibited activities). On these days officials were prohibited from various activities and common men were forbidden to "make a wish", and at least the 28th was known as a "rest-day".[13] On each of them, offerings were made to a different god and goddess.

In a frequently-quoted suggestion going back to the early 20th century[by whom?][14] the Hebrew

Enûma Eliš, tentatively reconstructed [according to whom?] "[Sa]bbath shalt thou then encounter, mid[month]ly"..[13]

Achaemenid period

The Zoroastrian calendar follows the Babylonian in relating the seventh and other days of the month to Ahura Mazda.[15] The forerunner of all modern Zoroastrian calendars is the system used to reckon dates in the Persian Empire, adopted from the Babylonian calendar by the 4th century BC.

Temple of Solomon
. While the seven-day week in Judaism is tied to
Babylonian Captivity
of the Jews in the 6th century BC. At least since the Second Temple period under Persian rule, Judaism relied on the seven-day cycle of recurring Sabbaths[17]

Tablets[

lunation of 29 or 30 days basically contained three seven-day weeks, and a final week of eight or nine days inclusive, breaking the continuous seven-day cycle.[13]
The Babylonians additionally celebrated the 19th as a special "evil day", the "day of anger", because it was roughly the 49th day of the (preceding) month, completing a "week of weeks", also with sacrifices and prohibitions.[13]

Difficulties with

lunar cycle[18] include reconciling the differences between an unbroken week and a lunar week, and explaining the absence of texts naming the lunar week as Shabbat in any language.[19]

Hellenistic and Roman era

By

Pharisee as fasting "twice in the week" (Greek
dis tou sabbatou).

The ancient Romans traditionally used the eight-day

Roman era
(2nd century). [21]


The continuous seven-day cycle of the days of the week can be traced back to the reign of Augustus; the first identifiable date cited complete with

day of the week is 6 February 60, identified as a "Sunday" (as viii idus Februarius dies solis "eighth day before the ides of February, day of the Sun") in a Pompeiian grafitto. According to the currently-used Julian calendar, 6 February 60 was, however, a Wednesday. This is explained by the existence of two conventions of naming days of the weeks based on the planetary hours system, 6 February was a "Sunday" based on the sunset naming convention, and a "Wednesday" based on the sunrise naming convention.[22]

Adoption in Asia

The earliest known reference in Chinese writings to a seven-day week is attributed to Fan Ning, who lived in the late 4th century in the

Tang Dynasty
).

The Chinese variant of the planetary system was soon brought to Japan by the Japanese monk

Meiji
era.

The seven-day week was known in India by the sixth century, referenced in the

Pañcasiddhāntikā.[citation needed
]. Shashi (2000) mentions the
terminus ad quem (viz. 1st century BCE–1st century CE) The terminus a quo cannot be stated with certainty".[23][24]

Christian Europe

Further information:
Easter Week

The seven-day weekly cycle has remained unbroken in Europe for almost two millennia, despite changes to the

computistic tables to an Ethiopic copy of an early Alexandrian table beginning with the Easter of 311 AD.[25]

"The Roman context of the spread of Christianity meant that Rome contributed a lot to the structure and calendar of the new faith."[26]

A tradition of divinations arranged for the days of the week on which certain feast days occur develops in the Early Medieval period. There are many later variants of this, including the German Bauern-Praktik and the versions of Erra Pater published in 16th to 17th century England, mocked in Samuel Butler's Hudibras. South and East Slavic versions are known as koliadniki (from koliada, a loan of Latin calendae), with Bulgarian copies dating from the 13th century, and Serbian versions from the 14th century.[27] Medieval Christian traditions associated with the lucky or unlucky nature of certain days of the week survived into the modern period. This concerns primarily Friday, associated with the crucifixion of Jesus. Sunday, sometimes personified as Saint Anastasia, was itself an object of worship in Russia, a practice denounced in a sermon extant in copies going back to the 14th century.[28]


Sunday, in the ecclesiastical numbering system also counted as the feria prima or first day of the week at the same time figures as the "

eighth day
", and has occasionally been so called in Christian liturgy. [29]

Justin Martyr wrote: "the first day after the Sabbath, remaining the first of all the days, is called, however, the eighth, according to the number of all the days of the cycle, and [yet] remains the first".[30]

Particularly

octave
.

Week numbering

Further information: Leap week calendar
World map showing first day of week used in different countries
  Saturday
  Sunday
  Monday
World map showing holidays of week in different countries
  Thursday
  Friday
  Saturday
  Sunday

Weeks in a Gregorian calendar year can be numbered for each year. This style of numbering is commonly used (for example, by schools and businesses) in some European and Asian countries, but rare elsewhere.

ISO 8601 includes the ISO week date system, a numbering system for weeks – each week begins on a Monday and is associated with the year that contains that week's Thursday (so that if a year starts in a long weekend Friday–Sunday, week number one of the year will start after that). For example, week 1 of 2004 (2004W01) ran from Monday 29 December 2003 to Sunday, 4 January 2004, because its Thursday was 1 January 2004, whereas week 1 of 2005 (2005W01) ran from Monday 3 January 2005 to Sunday 9 January 2005, because its Thursday was 6 January 2005 and so the first Thursday of 2005. The highest week number in a year is either 52 or 53 (it was 53 in the year 2004). Schematically, this ISO convention translates as follows:

Dates in January Effect
M T W T F S S Week number Week assigned to
1 2 3 4 5 6 7 1 New year
1 2 3 4 5 6 1 New year
1 2 3 4 5 1 New year
1 2 3 4 1 New year
1 2 3 53 Previous year
1 2 53 or 52 Previous year
1 52 Previous year

In some countries, though, the numbering system is different from the ISO standard. At least six numberings are in use:[31][32]

System First day of week First week of year contains Can also be last week of previous year Used by/in
ISO-8601 Monday 4 January 1st Thursday 4–7 days of year no                     EU and most of other European countries
(Islamic) Saturday 1 January 1st Friday 1–7 days of year yes Much of the Middle East
(North American) Sunday 1 January 1st Saturday 1–7 days of year yes Canada, USA, Mexico, China, Japan

The semiconductor package date code is often a 4 digit date code YYWW where the first two digits YY are the last 2 digits of the calendar year and the last two digits WW are the two-digit week number.[33][34]

The tire date code mandated by the US DOT is a 4 digit date code WWYY with two digits of the week number WW followed by the last two digits of the calendar year YY.[35]

"Weeks" in other calendars

The term "week" is sometimes expanded to refer to other time units comprising a few days. Such "weeks" of between four and ten days have been used historically in various places.[36] Intervals longer than 10 days are not usually termed "weeks" as they are closer in length to the fortnight or the month than to the seven-day week.

Pre-modern calendars

Calendars unrelated to the Chaldean, Hellenistic or Judeo-Christian traditions often have time cycles between the day and the month of varying lengths, sometimes also called "weeks".

An eight-day week was used in Ancient Rome and possibly in the pre-Christian Celtic calendar Traces of a nine-day week are found in Baltic languages and in Welsh. The ancient Chinese calendar had a

French Republican Calendar
, dividing its 30-days months into thirds).

A six-day week is found in the

Akan Calendar
. Several cultures used a five-day week, including the 10th-century
Icelandic calendar, the Javanese calendar
, and the traditional cycle of market days in
Korea
. The
Igbo
have a "market week" of four days. Evidence of a "three-day week" has been derived from the names of the days of the week in
Guipuscoan Basque.[37]

The Aztecs divided a ritual cycle of 260 days, known as

Tonalpohualli, into 20 weeks of 13 days known as Trecena. They also divided the solar year into 18 periods of 20 days and five nameless days known as Nemontemi, creating a "20-day month" divided into four "five-day "weeks".[38]
The Maya divided a 260-day ritual cycle known
Haab'
, into 18 periods of 20 days, Uinal, and five nameless days known as Wayeb'.

The Balinese

Pawukon
is a 210-day calendar consisting of 10 different concurrent weeks of 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 days.

Modern calendar reforms

Further information:
French Revolutionary Calendar § Ten days of the week

A 10-day week, called décade, was used in France for nine and a half years from October 1793 to April 1802; furthermore, the Paris Commune adopted the Revolutionary Calendar for 18 days in 1871.

Soviet calendar
12 December 1937
(Below 12:)
"Sixth day of the six-day week"
—————————
"Election day for the Supreme Soviet of the USSR"
Main article: Soviet calendar

Between 1929 and 1931 the

USSR changed from the seven-day week to a five-day week. There were 72 weeks and an additional five national holidays inserted within three of them totaling a year of 365 days.[citation needed
] In 1931, after its brief experiment with a five-day week, the Soviet Union changed to a six-day week. Every sixth day (6th, 12th, 18th, 24th and 30th) of the
Gregorian Calendar was a state rest day. The five additional national holidays in the earlier five-day week remained and did not fall on the state rest day. But as January, March, May, July, August, October and December have 31 days, the week after the state rest day of the 30th was seven days long (31st–7th). This extra day was a working day for most or an extra holiday for others. Also as February is only 28 or 29 days depending on whether it is a leap year or not, the first of March was also made a state rest day, although not every enterprise conformed to this. To clarify, the week after the state rest day, 24/25 February to 1 March, was only five or six days long, depending on whether it was a leap year or not. The week after that, 2 to 6 March, was only five days long.[citation needed
] The calendar was abandoned 26 June 1940 and the seven-day week reintroduced the next day.[citation needed]

See also

Wikimedia Commons has media related to Week.

References

  1. ^ Richards, E. G. (2013). "Calendars". In S. E. Urban & P. K. Seidelmann, eds. Explanatory Supplement to the Astronomical Almanac, 3rd ed. (pp. 585–624). Mill Valley, Calif.: University Science Books. 2013, pp. 592, 618. This is equivalent to saying that JD0, i.e. 1 January 4713 BC of the proleptic Julian calendar, was a Monday.
  2. ^ E. G. Richards, Mapping Time, the Calendar and History, Oxford 1999. p. 269.
  3. ^ Max Vasmer, Russisches etymologisches Wörterbuch, s.v. понедельник; however, the Slavic languages later introduced a secondary numbering system which names Tuesday as the "second day".
  4. ISBN 978-0-520-21859-8
    . McKenna, Stephen (1938). "Pagan Survivals in Galicia in the Sixth Century". Paganism and Pagan Survivals in Spain Up to the Fall of the Visigothic Kingdom. Catholic University of America. pp. 93–94. Retrieved 20 March 2013.
  5. ^ "day of preparation", i.e. the day before Sabbath, c.f. Luke 23:54 (καὶ ἡμέρα ἦν Παρασκευῆς, καὶ σάββατον ἐπέφωσκεν.)
  6. ^ a b Eviatar Zerubavel, The Seven Day Circle: The History and Meaning of the Week, University of Chicago Press, 1989 [1985], p. 14.
  7. ^ Leland, S. Copeland (April 1939). "Sources of the Seven-Day Week". Popular Astronomy. Vol. XLVII, No. 4: 176 ff. {{cite journal}}: |volume= has extra text (help)
  8. ISBN 978-0-7661-3698-4
    . Retrieved 17 March 2009.
  9. ^ It was transmitted to China in the 8th century by Manichaeans, via the country of Kang (a Central Asian polity near Samarkand). Tang-era adoption is documented in the writings of the Chinese Buddhist monk
    Yi Jing and the Ceylonese Buddhist monk Bu Kong
    . According to the Chinese encyclopaedia Cihai (辞海), there is some evidence that the system had been adopted twice, the first time already in the 4th century (
    Jin dynasty
    ), based on a reference by a Jin era astrologer, Fan Ning (範寧 / 范宁). The Cihai under the entry for "seven luminaries calendar" (七曜历/七曜曆, qī yào lì) has: "method of recording days according to the seven luminaries [七曜 qī yào]. China normally observes the following order: Sun, Mon, Mars, Mercury, Jupiter, Venus, and Saturn. Seven days make one week, which is repeated in a cycle. Originated in ancient Babylon (or ancient Egypt according to one theory). Used by the Romans at the time of the 1st century AD, later transmitted to other countries. This method existed in China in the 4th century. It was also transmitted to China by Manichaeans in the 8th century from the country of Kang (康) in Central Asia." (translation after Bathrobe's Days of the Week in Chinese, Japanese & Vietnamese, plus Mongolian and Buryat (cjvlang.com)]
  10. Ishtar (Venus), Ninurta (Saturn), Nabu (Mercury) and Nergal
    (Mars).
  11. ^ Leland, S. Copeland (April 1939). "Sources of the Seven-Day Week". Popular Astronomy. Vol. XLVII, No. 4: 176. {{cite journal}}: |volume= has extra text (help) Copeland (1939) cites as the date for Gudea "as early as 2600 BC"; the modern estimate according to the
    short chronology
    places Gudea in the 22nd century BC. By contrast, Anthony R. Michaelis in "The Enigmatic Seven ", Interdisciplinary Science Reviews 7, p. 373 claims that "the first great empire builder, King Sargon I of Akkad ([ruled] 2335 to 2279 BC [viz., middle chronology]), decreed a seven-day week in his Empire. He lived for 56 years, established the first Semitic Dynasty and defeated the Sumerian City States. Thus the Akkadian language spread, it was adopted by the Babylonians, and the seven-day week was similarly inherited from him."
  12. ^ "Each account is aranged in a series of sevens, the Babylonian in seven tablets, the Hebrew in seven days. Each of them places the creation of man in the sixth division of its series." cited after: Albert T. Clay, The Origin of Biblical Traditions: Hebrew Legends in Babylonia and Israel, 1923, p. 74.
  13. ^ a b c d Pinches, T.G. (2003). "Sabbath (Babylonian)". In Hastings, James (ed.). Encyclopedia of Religion and Ethics. Vol. 20. Selbie, John A., contrib. Kessinger Publishing. pp. 889–891.
    ISBN 978-0-7661-3698-4
    . Retrieved 17 March 2009.
  14. ^ referenced in The American Antiquarian and Oriental Journal 30 (1908)
  15. ^ Boyce, Mary (ed. & trans.). Textual Sources for the Study of Zoroastrianism. University of Chicago Press, 1984, p. 19-20.
  16. ^ Senn, Frank C. (1997). Christian Liturgy: Catholic and Evangelical. Fortress Press.
    ISBN 978-0-8006-2726-3
    .
  17. ^ Senn, Frank C. (1997). Christian Liturgy: Catholic and Evangelical. Fortress Press.
    ISBN 9780800627263
    .
  18. Johannesburg, South Africa
    : Ivri Publishing Society, Ltd. pp. 2, 12. Retrieved 26 March 2009.
  19. ^ Sampey, John Richard (1915). "Sabbath: Critical Theories". In Orr, James (ed.). The International Standard Bible Encyclopedia. Howard-Severance Company. p. 2630.
  20. ^ Strong's Concordance, 4521.
  21. ^ Zerubavel, Eviatar (1989). The Seven Day Circle: The History and Meaning of the Week. University of Chicago Press. p. 45.
    ISBN 978-0-226-98165-9
    .     Senn, Frank C. (1997). Christian Liturgy: Catholic and Evangelical. Fortress Press.
    ISBN 9780800627263
    .
  22. ^ Nerone Caesare Augusto Cosso Lentuol Cossil fil. Cos. VIII idus Febr(u)arius dies solis, luna XIIIIX nun(dinae) Cumis, V (idus Februarias) nun(dinae) Pompeis. Robert Hannah, "Time in Written Spaces", in: Peter Keegan, Gareth Sears, Ray Laurence (eds.), Written Space in the Latin West, 200 BC to AD 300, A&C Black, 2013, p. 89.
  23. ^ Shashi, Shyam Singh (2000). Encyclopaedia Indica India, Pakistan, Bangladesh Vol. 76 Major dynasties of ancient Orissa: India, Pakistan, Bangladesh. Anmol Publications PVT. LTD. pp. 114–115.
    ISBN 978-81-7041-859-7
    .
  24. ^ Kane, Dr. Pandurang Vaman (1930–1962). History of Dharmasastra.
  25. ^ Neugebauer, Otto (1979). Ethiopic astronomy and computus. Verl. d. Österr. Akad. d. Wiss.
    ISBN 978-3-7001-0289-2
    .
  26. ^ http://www.bbc.co.uk/religion/0/20394641
  27. ^ William Francis Ryan, The Bathhouse at Midnight: An Historical Survey of Magic and Divination in Russia, Penn State Press, 1999 p. 380.
  28. ^ William Francis Ryan, The Bathhouse at Midnight: An Historical Survey of Magic and Divination in Russia, Penn State Press, 1999 p. 383.
  29. nundinal cycle (literally "nine-days" cycle, describing an eight-day week) of the Roman calendar, or the Resurrection of Jesus
    (after a period of less than 48 hours) being described as happening on the "third day"
  30. ^ Dialogue with Trypho, chapter XLI
  31. ^ Weeknumber sorted by definition
  32. ^ Calendar Weeks
  33. ^ "Marking Convention".
  34. ^ "Top Mark Convention - 4-Digit Date Code".
  35. ^ "49 CFR 574.5 - Tire identification requirements.".
  36. OED
    s.v. "week n.", entry 1.c.: "Sometimes applied transf. to other artificial cycles of a few days that have been employed various peoples"
  37. ^ Astronomy and Basque Language, Henrike Knörr, Oxford VI and SEAC 99 "Astronomy and Cultural Diversity", La Laguna, June 1999. It references Alessandro Bausani, 1982, The prehistoric Basque week of three days: archaeoastronomical notes, The Bulletin of the Center for Archaeoastronomy (Maryland), v. 2, 16-22. 1. astelehena ("week-first", Monday), 2. asteartea ("week-between", Tuesday), 3. asteazkena ("week-last", Wednesday).
  38. ^ http://www.aztec-history.com/aztec-calendar-stone.html

Further reading

  • Colson, Francis Henry (1926). The Week: An Essay on the Origin and Development of the Seven-day Cycle. Cambridge University Press.
    OCLC 59110177
    .


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