Gerīmbōc
'''Gerīmbōc''' is endebyrdnes tō getitelienne [[gerīmbōce dagas]] tō [[dæg|dagum]]. Þā ''tælmearca'' ārīsen fram þǣre undergietenan styrunge [[steorlic]]ra þinga. '''Gerīmbōc''' is ēac fæst begīeming (oft paper), þe gebisenaþ þā endebyrdnesse (for bisne, ''desktop gerīmbōc''). Man brȳcþ ēac þæt ƿord tō tācnienne sum rīm gesierƿodra belimpa (for bisne, ''dōmgerīmbōc'').

== Gerīmbōcendebyrdnessa ==
Mǣst þāra gerīmbōca þe man brȳcþ on eorðan sind '''[[Mōna|mōnelic]]''', '''[[Sunne|sunnlic]]''',  '''[[mōnesunnlic gerīmbōc|mōnesunnlic]]''' oþþe '''arbitrary'''.

* ''Mōnelic gerīmbōc'' fylgaþ þæs mōnan styrunge ([[mōna|moon phases]]); bīspell is sēo [[Islamisc gerīmbōc|Islamisce gerīmbōc]].  

* ''Sunnlic gerīmbōc'' fylgaþ [[tīdlic gēar|tīdlice]] onƿendunge þære sunnan styrunge þe man siehþ; bīspell is sēo [[Persisc gerīmbōc|Persisce gerīmbōc]].

* ''Mōnasunnlic gerīmbōc'' fylgaþ þæs mōnan and þǣre sunnan styrunge; bīspell is sēo [[Hebrēisc gerīmbōc|Iudēisce gerīmbōc]].

* ''Arbitrary gerīmbōc'' ne fylgaþ þæs mōnan and ne þǣre sunnan styrunge; bīspellan sind sēo [[wucu|ƿucu]], and se [[Iūlisca dæg]] þe tungolǣmenn brūcaþ.

Sume gerīmbēc þyncaþ fylgian Venuses styrunge; bīspellan sind sume þāra ealdra Ǣgyptiscra gerīmbōca; þynceþ þæt menn dōþ þūs mǣste nēah þǣm Equator.

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===[[Sunnlic gerīmbōc|Sunnlic gerīmbēc]]===
====Dagas gebrȳcode be sunnlicum gerīmbōcum ====
Sunnlic gerīmbēc assign a ''tealmearce'' tō ǣlcum [[sunnlic tīd|sunnlicum dæge]]. A [[dæg]] may consist of the period between [[sunrise]] and [[sunset]], with a following period of [[night]], or it may be a period between successive events such as two sunsets. The length of the interval between two such successive events may be allowed to vary slightly during the year, or it may be averaged into a [[solar time|mean solar day]]. Oðru gerīmbōce cynn magon brūcan ēac sunnlicne dæg.

====Julisc and Gregorisc gerīmbēc ====
Under the Roman Republic, the solar [[Iūlisc gerīmbōc]] was adopted.  It numbers days within months that are longer than the lunar cycle, so it is not convenient for tracking phases of the moon, but it does a better job of tracking the seasons.  Each calendar year has 365 days, except every 4th year which is a [[leap year]] of 366 days. So the mean calendar year is 365.25 days.

Unfortunately, Eorðes [[tropical year]] is a little less 365.25 days (it is approximately 365.242 days), so this calendar, too, slowly drifted out of sync with the seasons.  For such reasons, the the [[Gregorisc gerīmbōc]] was later adopted by most of the West, starting in 1582, and it has since become the world's dominant civic calendar.

====Future reform====
There have been a number of proposals for reform of the calendar, such as the [[Woruldes gerīmbōc]] and [[International Fixed Calendar]].  The [[United Nations]] considered adopting such a reformed calendar for a while in the 1950s, but these proposals have lost most of their popularity.

===[[Lunar calendar]]s===
Not all calendars use the solar year as a unit. A [[lunar calendar]] is one in which days are numbered within each [[moon phase]] cycle.  Because the length of the lunar month is not an even fraction of the length of the tropical year, a purely lunar calendar quickly drifts against the seasons.  It does, however, stay constant with respect to other phenomena, notably [[tide]]s. A '''[[lunisolar calendar]]''' is a lunar calendar that compensates by adding an extra month as needed to realign the months with the seasons.

Lunar calendars are believed to be the oldest calendars invented by mankind. [[Cro-Magnon]] people are claimed to have invented one around 32,000 BC.

===[[Fiscal calendar]]s===
A fiscal calendar (such as a 5/4/4 calendar) fixes each month at a specific number of weeks to facilitate comparisons from month to month and year to year.  January always has exactly 5 weeks (Sunday through Saturday), February has 4 weeks, March has 4 weeks, etc.  Note that this calendar will normally need to add a 53rd week to every 5th or 6th year, which might be added to December or might not be, depending on how the organization uses those dates. There exists an international standard way doing this (the [[ISO 8601|ISO week]]).  Sēo ISO week runs Monday through Sunday and Week 1 is always the week that contains January 4 Gregorian.

==Gerīmbōce underdǣlunga ==
Nearly all calendar systems group consecutive days into "[[month]]s" and also into "[[year]]s". In a ''solar calendar'' a ''year'' approximates Earth's [[tropical year]] (that is, the time it takes for a complete cycle of [[season]]s), traditionally used to facilitate the planning of [[agriculture|agricultural]] activities. In ''mōnaþlicre gerīmbēc'', se ''mōnaþ'' approximates the cycle of the moon phase. Consecutive dagas may be grouped into other periods such as the [[week]].

Because the number of days in the ''tropical year'' is not a whole number, a solar calendar must have a different number of days in different years. This may be done with [[leap year]]s. The same applies to months in a lunar calendar and also the number of months in a year in a lunisolar calendar. This is generally known as [[intercalation]]. Even if a calendar is solar, but not lunar, the year cannot be divided entirely into months that never vary in length.

Cultures may define other units of time, such as the [[week]], for the purpose of scheduling regular activities that do not easily coincide with months or years.

==Other calendar types==
===Complete and incomplete calendars===
Calendars may be either complete or incomplete.  Complete calendars provide a way of naming each consecutive day, while incomplete calendars do not.  The early Roman calendar, that had no way of designating the days of the winter months other than to lump them together as "winter", is an example of an incomplete calendar, while the Gregorian calendar is an example of a complete calendar.

===Pragmatic, theoretical and mixed Calendars===
Calendars may be pragmatic, theoretical, or mixed.

A ''pragmatic calendar'' is one that is based on observation; an example is the religious Islamic calendar. Such a calendar is also referred to as an ''observation-based'' or ''astronomical'' calendar. The advantage of such a calendar is that it is perfectly and perpetually accurate. The disadvantage is that working out when a particular date would occur is difficult.

A ''theoretical calendar'' is one that is based on a strict set of rules; an example is the Jewish calendar. Such a calendar is also referred to a ''rule-based'' or ''arithmetical'' calendar. The advantage of such a calendar is the ease of working out when a particular date occurs. The disadvantage is imperfect accuracy. Furthermore if the calendar is very accurate, its accuracy perishes slowly over time owing to changes in Earth's rotation. This limits the lifetime of an accurate theoretical calendar to a few thousand years. After then, the rules would need to be modified from observations made since the invention of the calendar, resulting in a mixed calendar.

A ''mixed calendar'' combines the features of both pragmatic and theoretical calendars.  Mixed calendars usually begin as theoretical calendars, but are adjusted pragmatically
when some type of asynchrony becomes apparent; the shift from the Julian to the Gregorian calendar is such an example.

Sēo Gregorisce gerīmbōc, swā endemeste bisen, is complete, solar, and mixed.

==Uses==
The primary practical use of a calendar is to identify days: to be informed about and/or to agree on a future event and to record an event that has happened. Days may be significant for civil, religious or social reasons. For example, a calendar provides a way to determine which days are religious or civil [[holiday]]s, which days mark the beginning and end of business accounting periods, and which days have legal significance, such as the day taxes are due or a contract expires. Also a calendar may, by identifying a day, provide other useful information about the day such as its season.

Calendars are also used as part of a complete [[timekeeping]] system: date and [[time of day]] together specify a moment in [[time]].  In the modern world, written calendars are no longer an essential part of such systems, as the advent of accurate [[clock]]s has made it possible to record time independently of astronomical events.  

==Currently used calendars==
Calendars in widespread use today include the [[Gregorisc Calendar|Gregorisc calendar]], which is the ''[[de facto]]'' international standard, and is used almost everywhere in the world for civil purposes, including in China and India. The [[Hebrew calendar]] is the official calendar of [[Israel]]'s government, but the Gregorian calendar is much 
more widely used in Israel's business and day-to-day affairs. The [[Iranian calendar|Persian calendar]] is used in [[Iran]] and [[Afghanistan]]. The [[Islamic calendar]] is used by [[Muslim]]s the world over. The [[Chinese calendar|Chinese]], Hebrew, [[Hindu calendar]], and [[Julian calendar]]s are widely used for religious and/or social purposes.

Even where there is a commonly used calendar such as the Gregorian calendar, alternate calendars may also be used, such as a [[fiscal calendar]].

==Sēo ēac==
*[[List of calendars]]
*[[liturgical year]]
*[[gerīmbōc sancta]]
*[[Crīstlicu gerīmbōc]]
*[[Calculating the Day of the Week]]
*[[Cycles]]
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[[Flocc:Gerīmbōc|*]]
Gerīmbōc is endebyrdnes tō getitelienne gerīmbōce dagas tō dagum. Þā tælmearca ārīsen fram þǣre undergietenan styrunge steorlicra þinga. Gerīmbōc is ēac fæst begīeming (oft paper), þe gebisenaþ þā endebyrdnesse (for bisne, desktop gerīmbōc). Man brȳcþ ēac þæt ƿord tō tācnienne sum rīm gesierƿodra belimpa (for bisne, dōmgerīmbōc).

 Gerīmbōcendebyrdnessa 
Mǣst þāra gerīmbōca þe man brȳcþ on eorðan sind mōnelic, sunnlic,  mōnesunnlic oþþe arbitrary.

 Mōnelic gerīmbōc fylgaþ þæs mōnan styrunge (moon phases); bīspell is sēo Islamisce gerīmbōc.  

 Sunnlic gerīmbōc fylgaþ tīdlice onƿendunge þære sunnan styrunge þe man siehþ; bīspell is sēo Persisce gerīmbōc.

 Mōnasunnlic gerīmbōc fylgaþ þæs mōnan and þǣre sunnan styrunge; bīspell is sēo Iudēisce gerīmbōc.

 Arbitrary gerīmbōc ne fylgaþ þæs mōnan and ne þǣre sunnan styrunge; bīspellan sind sēo ƿucu, and se Iūlisca dæg þe tungolǣmenn brūcaþ.

Sume gerīmbēc þyncaþ fylgian Venuses styrunge; bīspellan sind sume þāra ealdra Ǣgyptiscra gerīmbōca; þynceþ þæt menn dōþ þūs mǣste nēah þǣm Equator.

*