Week

For more details on each day of the week, see Week-day names.

For the TV station in the Peoria-Bloomington, Illinois market, see WEEK-TV.

A week is a time unit equal to a number of days, now usually seven days. Weeks of between 4 and 20 days have been used historically in various places.

Four-day

Main article: Igbo Culture § Calendar

The Igbo of Nigeria have a traditional calendar with a 4-day week. This "market week" features prominently in the fiction of Chinua Achebe.

Five-day

Javanese

Main article: Javanese calendar § Pasaran cycle

The Javanese people of Indonesia have a 5-day week known as the Pasaran cycle. This is still in use today and superimposed with Gregorian calendar and Islamic calendar to become what is known as the Wetonan Cycle.

Soviet Union

Main article: Soviet calendar § Five-day weeks

Between 1929 and 1931 USSR changed from the 7-day week to a 5-day week. There were 72 weeks and an additional 5 national holidays inserted within 3 of them totaling a year of 365 days.

Six-day

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

Soviet Union

Main article: Soviet calendar § Six-day weeks

In 1931 after the Soviet Union's 5-day week they changed to a 6-day week. Every 6th day (6th, 12th, 18th, 24th and 30th) of the Gregorian Calendar was a state rest day. The 5 additional national holidays in the earlier 5 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 7 days long (31st-7th). This extra day was a working day for most or extra holiday for others.

Also as February is only 28 or 29 days depending if a leap year or not, the 1st 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 5 or 6 days long, depending if a leap year or not. The week after that, 2 to 6 March, was only 5 days long.

The calendar was abandoned 26 June 1940 and the 7-day week reintroduced the day after.

Akan

Main article: Akan Calendar

The Akan people have 42 day cycle known as Adaduanan. The Adaduanan cycle appears to be based on an older six-day week, still extant in some northern Guan communities such as the Nchumuru , on which is superimposed a seven-day week which may have been brought south with itinerant traders from the Savannah. The six-day week is referred to as Nanson (literally seven-days) and reflects the lack of zero in the numbering systems; the last day and the first day are both included when counting the days of a week.

Seven-day

Main articles: Seven-day week and Week-day names

The earliest evidence of continuous use of a seven-day week appears with the Jews during the Babylonian Captivity in 586 BCE, though this in turn stems from a much earlier social custom, attested from the beginning of Genesis, and made a social institution through the fourth commandment, the commandment to keep Sabbath. The proposed reform, World Calendar, has 52 weeks and one or two extra weekless days each year, which do not count in the weekly cycles.

Eight-day

Etruscans (and Romans)

Main article: Roman calendar § Nundinal cycle

The ancient Etruscans developed an 8-day market week known as the nundinal cycle around 8th or 7th century BCE. This was passed on to the Romans no later than the 6th century BCE. As Rome expanded it encountered the 7-day week and for a time attempted to include both. The popularity of the 7-day rhythm won and the 8-day week disappeared forever.

The cycle of seven days, named after the sun, the moon, and the five planets visible to the naked eye, was already customary in the time of Justin Martyr, who wrote of the Christians meeting on the Day of the Sun (Sunday).

Emperor Constantine eventually established the 7-day week in the Roman calendar and in 321 CE.

8-day timetables that are not 8-day weeks have been known. At Radley College, the school works on a rotating 8-day timetable that excludes Sunday. Days are numbered 1 to 8. In Week 1, Monday is Day 1, Saturday is Day 6, Sunday is assigned no number, and so in Week 2, Monday is Day 7, Wednesday Day 1, Saturday Day 4, and the following Sunday is again an uncounted interval. Thus this is an example rather of a 9-day week or, when two Sundays fall within a cycle of Days 1 to 8, a 10-day week.

Celts

It is believed the Celtic people used a nine-night week. The moon was used to measure one day from another so nights were more significant. The 9 nights divided nicely into a Sidereal Month of 27 nights. Each week of 9 nights had 8 days. There was also a half week of 5 nights and 4 days.

Christian "eighth day"

Main article: Octave (liturgical)

For early Christians, Sunday, as well as being the first day of the week, was also the spiritual eighth day, as it symbolised the new world created after Christ's resurrection. The concept of the eighth day was symbolic only and had no effect on the use of the seven-day week for calendar purposes. 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". This does not set up an 8-day week, since the eighth day, not the following day, is considered to be also the first of a cycle.

A period of eight days, starting and ending on a Sunday or starting on a major feast day and finishing on the same day of the week a (7-day) week later, is called an octave. For centuries these were a major feature of the liturgical calendar, particularly of the Roman Catholic Church, and some are still observed, though the number of such octaves has now been radically reduced. Some modern Church uses also preserve the idea of an eight-day period, starting and finishing on the same day of the week, and retain the name "octave" for them; for example, many churches observe an annual "Octave of Prayer for Christian Unity" on 18-25 January or in the week that begins with Pentecost Sunday.

Nine-day

The Gediminas Sceptre, a medieval Lithuanian calendar. Showing 12 months and 9 days in a week

Lithuanian

In the 14th century the Grand Duchy of Lithuania used a solar-lunar calendar. The structure of this calendar was understood with the help of the so-called Gediminas Sceptre discovered in 1680

Ancient Balts

Historical records give evidence that the week of ancient Balts was nine-days long. Thus, the sidereal month must have been divided into three parts.

Ten-day

China

The Chinese 10 day week went as far back as the Shang Dynasty (1200-1045 BCE). The law in the Han Dynasty (206 BCE – 220 CE) required officials of the empire to rest every 5 days, called "mu", while it was changed into 10 days in the Tang Dynasty (618 CE – 907CE), called "huan" or xún (旬). Months were almost 3 weeks long (alternating 29 and 30 days to keep in line with the lunation). The weeks were labelled shàng xún (上旬), zhōng xún (中旬), and xià xún (下旬) which mean roughly "upper", "middle" and "lower" week.

Egypt

Main article: Egyptian calendar

Ancient Egypt had a 10-day week, 3 weeks per month with 5 extra days at the end of the year.

France

Main article: French Revolutionary Calendar § Ten days of the week

A 10-day week was used in France for 12 years from late 1793 to 1805; furthermore, the Paris Commune adopted the Revolutionary Calendar for 18 days in 1871.

Thirteen-day

Aztecs

Main article: Tonalpohualli

The Aztecs divided a ritual cycle of 260 days, known as Tonalpohualli, into 20 weeks of 13 days known as Trecena.

Maya

Main article: Tzolk'in

The Maya divided a 260 ritual cycle known Tzolk'in as into 20 weeks of 13 days known as Trecena.

Twenty-day

Restored Aztec sun stone showing the 20 Days

Aztecs

Main article: Aztec calendar § Tonalpohualli

The Aztecs divided a solar year of 365 days, Xiuhpohualli into 18 periods of 20 days and 5 nameless days known as Nemontemi. Although some call this 20-day division or grouping a month, it has no relation to a lunation and therefore the word "week" is more appropriate.

Maya

Main article: Maya calendar § Haab'

The Maya also divided the year, Haab', into 18 periods of 20 days, Uinal, and 5 nameless days known as Wayeb'.

Other

Bali, Indonesia

Main article: Pawukon

The 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.

Hermetic lunar week

The Hermetic Lunar Week Calendar is one of many proposed reforms to the Gregorian Calendar. The lunation is divided into the four Moon Phases and has 6, 7, 8, or 9 days depending on the actual time difference between the full moon, First Quarter, new moon and Last Quarter.

Further reading

• Colson, Francis Henry (1926). The Week: An Essay on the Origin and Development of the Seven-day Cycle. The University press. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)

External links

• Englisc Rímbóc: The Anglo-Saxon Calendar
• Chisholm, Hugh, ed. (1911). Encyclopædia Britannica (11th ed.). Cambridge University Press. {{cite encyclopedia}}: Missing or empty |title= (help)