← Back to catalogue
Published

February 9

vr.tr.february-9 · thing-q2324

Let an agent handle February 9 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 February 9 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 February 9 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 February 9, 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 February 9? 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

February 9, day 40 of the year in the Gregorian calendar, with 325 days remaining (326 in leap years). Observances on this date vary by country and tradition.

Why it exists Filled

Let an agent handle February 9 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The ninth day of February
  • 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

  • Present a national or international observance as if it were marked everywhere.
  • Report on-this-day events without a source.
  • Mix Julian and Gregorian dates without saying which calendar is meant.
  • Use anniversaries of conflicts or atrocities to glorify violence or provoke communities.

Only with a human decision

  • Publishing commemorations that concern living people or recent tragedies.

May

  • Report the day's position in the Gregorian calendar and the observances held on it, naming who marks them.
  • List sourced historical events, births and deaths on this date.

Moral aspects Filled

  • Observances on this date differ by country and tradition; presenting one as universal erases others.
  • Anniversaries of contested events can be used to inflame conflict.

Who is affected

  • People who mark the day
  • Communities remembering events on it

Owners Filled

Steward

Nobody owns a date; the calendar is held in common and states and bodies decide their own observances.

Links to other meta-models Filled

parent

  • Q11188523 - registry parent class

related

  • February - month
  • February 8 - 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.february-9
  • Wikidata: Q2324 (https://www.wikidata.org/wiki/Q2324)
  • ISO 8601: --02-09 recurring date

Direct properties not applicable Not applicable

  • day of year: 40 day
  • days remaining: 325 or 326 days - common or leap year

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 9 February or February 9
  • ISO format --02-09
  • 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 Q2324: February 9 - identity and sense of the item
  2. Wikipedia: February 9 - 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-q2324/spec.json