February
Let an agent describe February as a calendar month, relay its length in common and leap years, position, seasons and notable observances, explain its name and the leap day, and route date-specific questions to entries for individual days.
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 describe February as a calendar month, relay its length in common and leap years, position, seasons and notable observances, explain its name and the leap day, and route date-specific questions to entries for individual days.
The second month of the year in the Julian and Gregorian calendars and the shortest, with 28 days in common years and 29 in leap years, following January and preceding March, falling in winter in the northern hemisphere and summer in the southern, named from the Roman purification festival Februa, and containing observances such as Valentine Day on 14 February, Black History Month in the United States and Canada, and Lunar New Year in many years.
What it is for: Not applicable; a calendar month.
It can be relay length and leap years; relay observances and seasons; explain name and history; route to specific days.
Distinguishing features
Shortest month
Leap day on 29 February
Winter month in the north
Purification festival origin
What it looks like
Not a visible object; a page of the calendar.
Physical character
days: 28 or 29 count - leap years have 29
position: 2 month - Gregorian calendar
starts on same weekday as: March and November months - in common years
How it is recognised
Second month, 28 or 29 days
Between January and March, winter in the north
Februarius was the last month of the early Roman year
Related models
is a kind of - in registry terms
follows - the first month
precedes - the third month
contains - on 29 February in leap years
In practice
Families and kinds
February in common years
February in leap years
February in the Julian and Gregorian calendars
February in other calendar traditions and names
observances in February
Identifiers
ISO 8601 02 month number
Standards and regulation
ISO 8601 date representation
Gregorian leap year rules
National public holiday laws for February observances
Failure modes and hazards
Leap year calculation errors
Software bugs around 29 February
Confusing observance dates across countries
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Calendar February in the calendar.
Reference.
Position
Position and length.
Position
Position.
- Where does February fall, and how many days does it have in a given year? definition
- Is the question about the Gregorian February or another calendar? boundary
Leap
Leap years.
Leap
Leap.
- How do the Gregorian leap year rules decide whether February has 29 days? definition
- Which entry fits leap year? action
Observances Observances.
Sources.
International
International and cultural days.
International
International.
- What observances fall in February, such as Valentine Day, World Cancer Day and Black History Month? provenance
- Which entry fits the specific observance? action
Movable
Movable feasts.
Movable
Movable.
- Which movable observances such as Lunar New Year and Carnival often fall in February, with sources? provenance
- Which sources are cited? provenance
Seasons Seasons and nature.
Science.
Seasons
Seasons.
Seasons
Seasons.
- What is the season in February in each hemisphere, and what weather is typical? provenance
- Which entry fits winter? action
History
Name and Roman origins.
History
History.
- How did February get its name and its short length in the Roman calendar? provenance
- Which references are standard? provenance
Context Culture and technology.
Context.
Culture
Culture.
Culture
Culture.
- How does February appear in literature, proverbs and traditions? provenance
- Which entry fits the specific tradition? action
Software
Leap day in software.
Software
Software.
- What software problems arise around 29 February, and how are they avoided? provenance
- Which entry fits leap year bug? action
What the second pass must settle
- Should leap day be the primary linked entry?
- How should observances be linked through day entries?
- How should names of February in other languages be recorded?