April
Let an agent describe April as a calendar month, relay its length, position, seasons and notable observances, explain its name and history, and route date-specific questions to entries for individual days.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Calendar April in the calendar.
Position
Position and length.
Position
Position.
- Where does April fall in the year, how long is it, and which weekday does it start on in a given year? definition
- Is the question about the Gregorian April or another calendar? boundary
Layout
Calendar layouts.
Layout
Layout.
- How do the seven layouts of April by starting weekday relate to other months? definition
- Which entry fits the specific day? action
Observances Observances.
International
International days.
International
International.
- What international observances fall in April, such as Earth Day and World Health Day? provenance
- Which entry fits the specific observance? action
National
National and religious.
National
National.
- What national holidays and religious feasts commonly fall in April, with sources? provenance
- Which sources are cited? provenance
Seasons Seasons and nature.
Seasons
Seasons.
Seasons
Seasons.
- What is the season in April in each hemisphere, and what weather is typical? provenance
- Which entry fits spring? action
Astronomy
Astronomy.
Astronomy
Astronomy.
- What astronomical events such as the Lyrid meteor shower occur in April? provenance
- Which references are standard? provenance
Context Name and culture.
Name
Name and history.
Name
Name.
- Where does the name April come from, and how was it placed in Roman calendars? provenance
- Which entry fits the Roman calendar? action
Culture
Culture.
Culture
Culture.
- How does April appear in literature, proverbs and traditions such as April Fools Day? provenance
- Which entry fits April Fools Day? action
Classifiers Filled
- Family
- Thing Registry
- Category
- Information and virtual systems
- Entry kind
- thing
- Plane
- INF
- Domain
- INF.KNW
- Other names and narrower kinds
- April starting on Monday
What it is Filled
The fourth month of the year in the Julian and Gregorian calendars, with 30 days, following March and preceding May, falling in spring in the northern hemisphere and autumn in the southern, named from the Latin Aprilis of uncertain origin, and containing observances such as April Fools Day, Easter in many years, Earth Day on 22 April and many national holidays; the arrangement of its days by starting weekday, such as April starting on Monday, determines the calendar layout of the month.
Why it exists Filled
Let an agent describe April as a calendar month, relay its length, position, seasons and notable observances, explain its name and history, and route date-specific questions to entries for individual days.
Distinguishing features Filled
- 30 days
- Spring month in the north
- Easter often falls in April
- April Fools Day
What robots and AI may and may not do Filled
Must not
- Assume April falls in spring for users in the southern hemisphere.
- Publish April 1 hoaxes that could pass for real news.
- Mix up April dates written in day-month and month-day order.
Only with a human decision
- Fixing deadlines in April that carry legal or financial consequences, such as tax filing.
May
- State the number of days in April and its place in the calendar.
- Convert April dates between the Gregorian and Julian calendars using calendar rules applicable to the specified date and year.
- Schedule events in April in the user's time zone.
Moral aspects Filled
- Many tax and fiscal years end or start in April; date errors cost people money.
- April fool hoaxes can spread as misinformation.
Who is affected
- People with April deadlines
- Readers of news on April 1
Owners Filled
Steward
The public: held in common; the calendar is maintained by convention and civil law.
Links to other meta-models Filled
parent
- Q18602249 - registry parent class
related
- month of the Gregorian calendar - in registry terms
- March - the third month
- May - the fifth month
contains
- Earth Day - on 22 April
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.april
- Wikidata: Q118 (https://www.wikidata.org/wiki/Q118)
- ISO 8601: 04 month number
Direct properties not applicable Not applicable
- days: 30 count
- position: 4 month - Gregorian calendar
- starts on same weekday as: July month - every year, and January in leap years
Plane INF: no invented physical properties.
Recognition optional Filled
- Fourth month, 30 days
- Between March and May, spring in the north
- Aprilis in the Roman calendar was the second month
- Not a visible object; a page of the calendar.
Capabilities and actions required Filled
- relay length and position
- relay observances and seasons
- explain name and history
- route to specific days
Hazards and failure modes required Filled
- Confusing observance dates across countries
- Movable feasts such as Easter not always in April
- Seasonal assumptions by hemisphere
Standards and interfaces required Filled
- ISO 8601 date representation
- National public holiday laws for April observances
Context of use required Filled
- Not applicable; a calendar month.
- April in the Gregorian and Julian calendars
- April starting on each weekday as calendar layouts
- April in other calendar traditions and names
- observances in April
Sources Filled
- Wikidata item Q118: April - identity and sense of the item
- Wikipedia: April - general description of the item
Open questions
- Should observances be linked through individual day entries?
- How should calendar layout aliases be recorded?
- How should names of April in other languages be recorded?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q118/spec.json