What Is the Normal Body Temperature for a 7 Week Old Baby
Our seven day week has been used for millennia by the Christian, Jewish, Islamic, Farsi and Chinese calendars, yet its origins are most uncertain.
- What Is the Origin of the vii-Day Week?
- What Do the Names of the Days of the Calendar week Mean?
- What is the System behind the Planetary Mean solar day Names?
- Has the 7-Mean solar day Week Cycle Ever Been Interrupted?
- Which 24-hour interval is the Solar day of Residue?
- What Is the First Day of the Week?
- What Is the Week Number?
- How can I calculate the week number?
- Do Weeks of Different Lengths Be?
- What day was a sure date?
Contemporary Mask. Mexico.
Since fourth dimension immemorial, the sun and the moon have inspired artists. Incan field workers would dirge, "The sun rains gilt, the moon rains silver." In art, the warm, golden sun is often depicted as male, while the cool, argent moon is portrayed every bit female.
What Is the Origin of the 7-Day Week?
Excavation into the history of the vii-twenty-four hour period week is a very complicated thing. Authorities accept very different opinions about the history of the week, and they oft present their speculations equally if they were indisputable facts. The only matter nosotros seem to know for certain about the origin of the seven-day week is that we know zip for sure.
The common explanation is that the seven-twenty-four hours calendar week was established as purple calendar in the tardily Roman empire and furthered past the Christian church building for historical reasons. The British Empire used the seven-day week and spread information technology worldwide. Today the seven-day week is enforced by global business and media schedules, especially television and banking.
The beginning pages of the Bible explain how God created the earth in six days and rested on the seventh. This 7th solar day became the Jewish day of rest, the sabbath, Saturday.
Extra-biblical locations sometimes mentioned as the birthplace of the vii-day week include: Babylon, Persia, and several others. The week was known in Rome before the advent of Christianity.
At that place are applied geometrical theories also. For case, if you wrap a rubber ring around 7 soda cans (or any other user-friendly circular objects). You lot get a perfect hexagon with the 7th tin can in the centre. It is the simply stable configuration of wrapping more than 3 circular objects. Four, v, and half dozen objects will slip from ane configuration to some other. Ancients wrapping tent poles, small logs for firewood, or other ciruclar objects might accept come upon this number and attach a mystical significance to it.
One viable theory correlates the seven twenty-four hour period week to the seven (astrological) "planets" known to the ancients: Sun, Moon, Mars, Mercury, Jupiter, Venus, and Saturn. The number seven does non seem an obvious choice to match lunar or solar periods, however. A solar year could be more evenly divided into weeks of v days, and the moon phases v-day and six-day weeks make a better brusk term fit (half-dozen times v is thirty) to the lunar (synodic) calendar month (of about 29.53 days) than the current week (4 times 7 is 28). The seven-day calendar week may have been chosen because its length approximates one moon stage (i quarter = 29.53 / 4 = 7.3825).
What Do the Names of the Days of the Week Hateful?
An answer to this question is necessarily closely linked to the language in question. Whereas well-nigh languages use the aforementioned names for the months (with a few Slavonic languages equally notable exceptions), there is neat variety in names that various languages use for the days of the week. A few examples will be given hither.
Except for the sabbath, Jews simply number their week days.
A related method is partially used in Portuguese and Russian:
| English language | Portuguese | Russian | Meaning of Russian proper noun |
|---|---|---|---|
| Monday | segunda-feira | ponedelnik | After "do-nothing" |
| Tuesday | terça-feira | vtornik | 2nd |
| Wednesday | quarta-feira | sreda | Middle |
| Thursday | quinta-feira | chetverg | 4th |
| Fri | sexta-feira | pyatnitsa | Fifth |
| Saturday | sabado | subbota | Sabbath |
| Sunday | domingo | voskresenye | Resurrection |
Almost Latin-based languages connect each solar day of the week with one of the seven "planets" of the ancient times: Sunday, Moon, Mercury, Venus, Mars, Jupiter, and Saturn. French, for example, uses:
| English | French | "Planet" |
|---|---|---|
| Monday | lundi | Moon |
| Tuesday | mardi | Mars |
| Wednesday | mercredi | Mercury |
| Thursday | jeudi | Jupiter |
| Fri | vendredi | Venus |
| Saturday | samedi | Saturn |
| Sunday | dimanche | (Sun) |
The link with the sun has been broken in French, merely Sun was chosen dies solis (mean solar day of the sun) in Latin.
It is interesting to note that also some Asiatic languages (for instance, Hindi, Japanese, and Korean) take a like human relationship betwixt the week days and the planets.
English has retained the original planets in the names for Saturday, Sunday, and Mon. For the four other days, yet, the names of Anglo-Saxon or Nordic gods accept replaced the Roman gods that gave name to the planets. Thus, Tuesday is named subsequently Tiw, Wednesday is named after Woden, Thursday is named after Thor, and Fri is named later on Freya.
→ See boosted connotations of the days of the week from a sampling of cultures and fourth dimension periods.
What is the System backside the Planetary Twenty-four hour period Names?
As nosotros saw in the previous section, the planets have given the week days their names following this order:
Moon, Mars, Mercury, Jupiter, Venus, Saturn, Sun
Why this particular order?
One theory goes every bit follows: If yous society the "planets" according to either their presumed altitude from Earth (assuming the Earth to exist the eye of the universe) or their period of revolution around the Globe, you make it at this order: Moon, Mercury, Venus, Dominicus, Mars, Jupiter, Saturn
At present, assign (in reverse gild) these planets to the hours of the day:
i=Saturn, 2=Jupiter, iii=Mars, 4=Sun, 5=Venus, 6=Mercury, 7=Moon, 8=Saturn, 9=Jupiter, etc., 23=Jupiter, 24=Mars
Then side by side twenty-four hour period will then go on where the old day left off:
i=Sunday, ii=Venus, etc., 23=Venus, 24=Mercury
And the side by side solar day will go
1=Moon, 2=Saturn, etc.
If you lot look at the planet assigned to the showtime hour of each day, you will note that the planets come in this gild:
Saturn, Sun, Moon, Mars, Mercury, Jupiter, Venus
This is exactly the society of the associated week days.
Coincidence? Maybe.
Has the vii-Twenty-four hours Week Cycle Ever Been Interrupted?
At that place is no record of the vii-twenty-four hour period calendar week cycle ever having been cleaved. Agenda changes and reform accept never interrupted the 7-day cycles. It very likely that the week cycles have run uninterrupted at least since the days of Moses (c. 1400 B.C.E.), possibly even longer.
Some sources claim that the ancient Jews used a calendar in which an extra Sabbath was occasionally introduced. But this is probably non true.
Which Day is the Twenty-four hours of Rest?
For the Jews, the Sabbath (Saturday) is the day of residual and worship. On this day God rested subsequently creating the earth.
Most Christians have fabricated Dominicus their day of residual and worship, considering Jesus rose from the dead on a Sunday.
Muslims utilize Fri as their day of rest and worship. The Qur'an calls Friday a holy day, the "male monarch of days."
What Is the First Day of the Week?
The Bible conspicuously makes the Sabbath the last solar day of the week, only does not share how that corresponds to our 7 twenty-four hour period calendar week. However through actress-biblical sources it is possible to determine that the Sabbath at the time of Christ corresponds to our current 'Saturday.' Therefore it is common Jewish and Christian do to regard Lord's day every bit the offset twenty-four hour period of the week (equally is as well evident from the Portuguese names for the week days). All the same, the fact that, for example, Russian uses the proper name "2nd" for Tuesday, indicates that some nations regard Mon as the first day.
In international standard ISO-8601 the International Organization for Standardization (ISO) has decreed that Monday shall be the first day of the calendar week.
What Is the Week Number?
International standard ISO-8601 assigns a number to each week of the year. A calendar week that lies partly in one year and partly in another is assigned a number in the twelvemonth in which most of its days lie. This ways that
Calendar week ane of whatsoever year is the week that contains 4 January,
or equivalently
Week 1 of whatsoever year is the week that contains the first Thursday in Jan.
Well-nigh years have 52 weeks, but years that beginning on a Thursday and leap years that start on a Wednesday accept 53 weeks.
Annotation: This week numbering system is not usually used in the Usa.
How can I calculate the week number?
If y'all know the appointment, how practice you calculate the respective week number (as defined in ISO-8601)?
- Using the formulas in the department on the Christian agenda, calculate the Julian Day Number, J.
- Perform the following calculations (in which the divisions are integer divisions in which the remainder is discarded):
d4 = (J+31741 - (J mod 7)) mod 146097 mod 36524 modernistic 1461 L = d4/1460 d1 = ((d4-L) mod 365) + L WeekNumber = d1/7+1
Note that if the calendar week number is one, 52, or 53, the week may lie in ii different agenda years. Nevertheless, the week is always considered to lie in the yr in which it is counted. Thus, 31 December of twelvemonth X, may belong to calendar week 1 of year Ten+one; similarly 1 January of year X may vest to week 52 or 53 or year X-1.
Exercise Weeks of Different Lengths Exist?
If you define a "week" as a 7-twenty-four hour period menses, plain the answer is no. But if you define a "week" as a named interval that is greater than a day and smaller than a month, the answer is yes.
The aboriginal Egyptians used a 10-day "calendar week", every bit did the French Revolutionary calendar (encounter French calendar).
The Maya calendar uses a 13 and a 20-day "calendar week" (see Mayan calendar).
The Soviet Union used both a 5-day and a six-24-hour interval week. In 1929-30 the USSR gradually introduced a 5-day calendar week. Every worker had one day off every calendar week, merely in that location was no fixed 24-hour interval of residuum. On 1 September 1931 this was replaced by a vi-day week with a fixed mean solar day of rest, falling on the 6th, twelfth, 18th, 24th, and 30th solar day of each month (1 March was used instead of the 30th twenty-four hours of February, and the final day of months with 31 days was considered an actress working mean solar day outside the normal vi-twenty-four hour period week cycle). A render to the normal 7-day week was decreed on 26 June 1940.
Lithuanians used a week of nine days before adopting Cristianity.
What mean solar day was a certain date?
To summate the mean solar day on which a detail date falls, the post-obit algorithm may exist used (the divisions are integer divisions, in which remainders are discarded). In July four, 1950, appointment=4, month=7, year=1950. Note that "modernistic" means the residuum when doing integer partition, e.grand., xx mod 7 = 6. That is, twenty divided past 7 is 2 and 6/7th (where six is the residual).
a = [(14 - month) / 12] y = year - a chiliad = month + 12 a - 2
For Julian calendar:
day = (v + date + y + y/4 + [31 grand / 12]) mod 7
For Gregorian calendar:
day = (date + y + y/4 - [y / 100] + [y / 400] + [31 m/ 12]) mod seven
Where day 0 is Sunday, day i is Monday, etc...
Source: http://www.webexhibits.org/calendars/week.html
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