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Published

September 29

vr.tr.september-29 · thing-q2882

Let an agent handle September 29 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 29 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 29 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 29, 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 29? 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 29, day 272 (day 273 in leap years) of the year in the Gregorian calendar, with 93 days remaining in both common and leap years. September 29 is Michaelmas in the Western Christian calendar, World Heart Day and the International Day of Awareness of Food Loss and Waste.

Why it exists Filled

Let an agent handle September 29 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The twenty-ninth 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

  • Misstate the religious meaning of Michaelmas or impose it on those who do not observe it.
  • Use awareness days as cover for unproven health claims or misleading marketing.
  • Miss that some legal or academic terms traditionally turn on this quarter day without checking local rules.

Only with a human decision

  • Fixing contract or rent deadlines tied to quarter days.

May

  • Report what September 29 marks, such as Michaelmas, World Heart Day and food loss awareness.
  • Use the date for scheduling in systems it is authorized to manage.

Moral aspects Filled

  • Religious feasts deserve accurate and respectful treatment.
  • Health awareness campaigns are trusted, so false claims attached to them mislead.

Who is affected

  • Observers of Michaelmas
  • Tenants and parties with quarter-day contracts

Owners Filled

Steward

Nobody owns a date; observances belong to the bodies that declared them.

Links to other meta-models Filled

parent

  • Q11187374 - registry parent class

related

  • September - month
  • September 28 - 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-29
  • Wikidata: Q2882 (https://www.wikidata.org/wiki/Q2882)
  • ISO 8601: --09-29 recurring date

Direct properties not applicable Not applicable

  • day of year: 272 or 273 day - common year, leap year where different
  • days remaining: 93 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 29 September or September 29
  • ISO format --09-29
  • 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 Q2882: September 29 - identity and sense of the item
  2. Wikipedia: September 29 - 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-q2882/spec.json