century
Let an agent explain centuries, relay counting conventions, naming, historical periodisation and other senses from calendar and historical sources, and distinguish centuries from decades, millennia, eras and centuries in sport or military units.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain centuries, relay counting conventions, naming, historical periodisation and other senses from calendar and historical sources, and distinguish centuries from decades, millennia, eras and centuries in sport or military units.
A period of 100 years, in the Gregorian calendar conventionally counted from year 1 to year 100 for the 1st century AD, so that the 21st century runs from 1 January 2001 to 31 December 2100, although popular usage often treats years such as 2000 to 2099 as a century; centuries are named in ordinal form, with the 1900s being the 20th century, and historians sometimes use concepts such as the long 19th century from 1789 to 1914. The word also names groups of 100, such as a cricket score of 100 runs and the Roman centuria.
What it is for: Organising time in hundred-year periods.
It can be explain counting conventions; relay naming and periodisation; describe other senses; distinguish related periods.
Distinguishing features
Hundred-year span
Ordinal naming
Counting ambiguity
Periodisation tool
What it looks like
Not a physical object; a calendar interval.
Physical character
length: 100 years
21st century: 2001-2100 years - strict convention
long 19th century: 1789-1914 note - Hobsbawm, attributed
How it is recognised
Period of 100 years
Century, hundred years
Decades are 10 years; millennia are 1,000 years; eras are variable; cricket centuries and Roman centuries are other senses
Related models
is a kind of - in registry terms
contains -
is part of -
is contrasted with - other sense
In practice
Families and kinds
centuries BC and AD
long and short centuries in historiography
centuries in other calendars
Standards and regulation
ISO 8601 date representation
Style guides on century naming
Failure modes and hazards
Confusing 1900s and 19th century
Year zero errors
Treating periodisation as fixed
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.century
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What a century is.
Definition.
Definition
Definition.
Definition
Definition.
- What is a century, and how does it differ from decades, millennia, eras and other senses of century? definition
- Is the question about calendars, history, sport or language? boundary
Naming
Naming.
Naming
Naming.
- Why are the 1900s called the 20th century? definition
- Which entry fits the specific century? action
Calendar Counting.
Sources.
Year zero
No year zero.
Year zero
Year zero.
- Why did the 21st century start in 2001 under the strict convention? measurement
- Which references are standard? provenance
BC and AD
BC and AD centuries.
BC and AD
BC and AD.
- How are centuries counted before and after AD 1? measurement
- Which sources are cited? provenance
History Periodisation.
Attribution.
Long centuries
Long and short centuries.
Long centuries
Long centuries.
- Why do historians speak of the long 19th and short 20th centuries, with views attributed? provenance
- Which entry fits long nineteenth century? action
Millennium
Millennium debate.
Millennium
Millennium.
- What was debated about whether 2000 or 2001 began the new millennium? provenance
- Is the presentation neutral and attributed? boundary
Context Other senses.
Context.
Cricket
Cricket century.
Cricket
Cricket.
- What is a century in cricket? provenance
- Which entry fits century (cricket)? action
Rome
Roman centuria.
Rome
Rome.
- What was a Roman century as a military and voting unit? provenance
- Which entry fits centuria? action
What the second pass must settle
- Should individual centuries be linked as instances?
- How should historiographical periodisation be presented?
- Should other senses be disambiguated?