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Published

April 12

vr.tr.april-12 · thing-q2499

Let an agent handle April 12 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Thing Registry Cross-cutting context XCT.TME
Bundle → Layer → Finding → QuestionsClassifiersWhat it isWhy it existsDistinguishing featuresWhat robots and AI may and may not doMoral aspectsOwnersLinks to other meta-modelsIdentity and identifiersDirect propertiesRecognitionCapabilities and actionsHazards and failure modesStandards and interfacesContext of useSources

Bundle → Layer → Finding → Questions Filled

4 bundles · 8 layers · 8 findings · 16 questions

Date Calendar facts.

Weekday

Computation.

Weekday

Weekday.

  1. On which weekday does April 12 fall in this year? measurement
  2. Is it a leap year? boundary

Calendar

Julian or Gregorian.

Calendar

Calendar system.

  1. Is the Julian or Gregorian calendar meant? boundary
  2. What is the equivalent date in the other calendar? measurement
Observances Holidays.

Holiday

Public holiday.

Holiday

Holiday status.

  1. Is April 12 a public holiday or observance here? provenance
  2. Which tradition or law sets it? provenance

Attribution

Traditions.

Attribution

Attributed observances.

  1. Which countries or communities observe something on this date, according to them? provenance
  2. Is the observance attributed rather than assumed? boundary
History Past events.

Events

On this day.

Events

Historical events.

  1. Which notable events happened on April 12, according to reliable sources? provenance
  2. Are dates given in the same calendar? boundary

Anniversaries

Recurring.

Anniversaries

Anniversaries.

  1. Which anniversaries fall on this date this year? provenance
  2. Which are round numbers? measurement
Planning Scheduling.

Countdown

Days until.

Countdown

Countdown.

  1. How many days until the next April 12? measurement
  2. From which date? definition

Work

Working day.

Work

Working day.

  1. Is it a working day for this organisation? provenance
  2. Do deadlines move? boundary

Classifiers Filled

Family
Thing Registry
Category
Cross-cutting context
Entry kind
thing
Plane
XCT
Domain
XCT.TME

What it is Filled

April 12, day 102 (day 103 in leap years) of the year in the Gregorian calendar, with 263 days remaining in both common and leap years. Observances on this date vary by country and tradition; it is the International Day of Human Space Flight.

Why it exists Filled

Let an agent handle April 12 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The twelfth day of April
  • Weekday varies by year
  • Observances vary by place
  • Julian and Gregorian dates differ by 13 days in this era

What robots and AI may and may not do Filled

Must not

  • Credit the first human spaceflight to the wrong person, mission or year.
  • Present a national or religious observance on April 12 as universal.
  • List on-this-day events for April 12 without a source.
  • Mix Julian and Gregorian dates for events on April 12.

Only with a human decision

  • Fixing a legal or contractual deadline that falls on April 12.

May

  • State that April 12 is day 102 of a common year and day 103 of a leap year.
  • Note that April 12 is the International Day of Human Space Flight and name other observances with their country.

Moral aspects Filled

  • Spaceflight anniversaries are claimed as national achievements and can be told in partisan ways.
  • Accurate dates respect the people who made history.

Who is affected

  • Communities marking the date
  • Readers of history
  • People with deadlines on the date

Owners Filled

Steward

The public: held in common; the Gregorian calendar is a shared convention.

Links to other meta-models Filled

parent

  • Q11185262 - registry parent class

related

  • April - month
  • April 11 - date
  • calendar date - category
  • ISO 8601 - notation

What else AI and robots need to interact with it Filled

Identity and identifiers required Filled

  • Vercy registry: vr.tr.april-12
  • Wikidata: Q2499 (https://www.wikidata.org/wiki/Q2499)
  • ISO 8601: --04-12 recurring date

Direct properties not applicable Not applicable

  • day of year: 102 or 103 day - common year, leap year where different
  • days remaining: 263 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 12 April or April 12
  • ISO format --04-12
  • Observances vary by country and tradition
  • A date on calendars.

Capabilities and actions required Filled

  • compute its weekday in a given year
  • check local and international observances
  • find sourced historical events
  • schedule events

Hazards and failure modes required Filled

  • Assuming observances are universal
  • Unsourced on-this-day events
  • Mixing Julian and Gregorian dates

Standards and interfaces required Filled

  • ISO 8601
  • National public holiday laws

Context of use required Filled

  • A calendar date for scheduling, holidays and anniversaries.
  • the recurring calendar date
  • specific dated days in given years

Sources Filled

  1. Wikidata item Q2499: April 12 - identity and sense of the item
  2. Wikipedia: April 12 - general description of the item

Open questions

  • Should dated days be separate entries?
  • How should observances be linked?
  • How should events be sourced?

Machine files

Card as JSON Specification Card backlog vercy.card/1

Provenance

thing registry research (pass 2) · unreviewed

Built from: models/things/publications/thing-q2499/spec.json