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Published

September 22

vr.tr.september-22 · thing-q2889

Let an agent handle September 22 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 September 22 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 September 22 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 September 22, 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 September 22? 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

September 22, day 265 (day 266 in leap years) of the year in the Gregorian calendar, with 100 days remaining in both common and leap years. September 22 often falls on the September equinox, and is World Rhino Day, World Car-Free Day, and Independence Day in Bulgaria, marking the 1908 declaration, and in Mali, marking independence in 1960.

Why it exists Filled

Let an agent handle September 22 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The twenty-second day of September
  • 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

  • State that the equinox always falls on September 22.
  • Present World Rhino Day or Car-Free Day as official holidays.
  • Repeat unsourced on-this-day claims as fact.
  • Confuse the 1908 Bulgarian declaration with other national days of Bulgaria.

Only with a human decision

  • Scheduling events in Bulgaria or Mali around their Independence Days.

May

  • Give the day number and days remaining for September 22 in the Gregorian calendar.
  • State the exact equinox time for a given year from an astronomical source.
  • Note World Rhino Day, World Car-Free Day and the Independence Days of Bulgaria and Mali with their sources.

Moral aspects Filled

  • World Rhino Day draws attention to species threatened by poaching.
  • Independence days carry national memory and must be described accurately.

Who is affected

  • People of Bulgaria and Mali
  • Rhinos and conservationists
  • Readers

Owners Filled

Steward

Nobody owns the date; national governments and observance organisers set the days.

Links to other meta-models Filled

parent

  • Q11187269 - registry parent class

related

  • September - month
  • September 21 - 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.september-22
  • Wikidata: Q2889 (https://www.wikidata.org/wiki/Q2889)
  • ISO 8601: --09-22 recurring date

Direct properties not applicable Not applicable

  • day of year: 265 or 266 day - common year, leap year where different
  • days remaining: 100 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 22 September or September 22
  • ISO format --09-22
  • 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 Q2889: September 22 - identity and sense of the item
  2. Wikipedia: September 22 - 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-q2889/spec.json