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Published

November 18

vr.tr.november-18 · thing-q3027

Let an agent handle November 18 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 November 18 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 November 18 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 November 18, 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 November 18? 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

November 18, day 322 (day 323 in leap years) of the year in the Gregorian calendar, with 43 days remaining in both common and leap years. November 18 is Independence Day in Latvia marking the proclamation of 1918, the former date of Oman's National Day, which moved to November 20 in 2025, and the anniversary of the adoption of standard time zones by North American railroads in 1883 and of the premiere of the Mickey Mouse film Steamboat Willie in 1928.

Why it exists Filled

Let an agent handle November 18 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The eighteenth day of November
  • 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 Latvia's national day as observed elsewhere.
  • Give contested accounts of Baltic history tied to the date as settled.
  • List on-this-day events without sources or mix calendar systems.

Only with a human decision

  • Planning closures or deadlines around Latvian public holidays for an organisation.

May

  • Give November 18 as day 322 of the Gregorian year, 323 in leap years.
  • Note that it is Independence Day in Latvia, marking the 1918 proclamation, with source.

Moral aspects Filled

  • National days carry memory of independence and occupation.
  • Unsourced anniversaries spread false history.

Who is affected

  • Latvians at home and abroad
  • Readers
  • Minorities in Latvia

Owners Filled

Steward

Nobody owns the date; the public holds it in common.

Links to other meta-models Filled

parent

  • Q11185474 - registry parent class

related

  • November - month
  • November 17 - 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.november-18
  • Wikidata: Q3027 (https://www.wikidata.org/wiki/Q3027)
  • ISO 8601: --11-18 recurring date

Direct properties not applicable Not applicable

  • day of year: 322 or 323 day - common year, leap year where different
  • days remaining: 43 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 18 November or November 18
  • ISO format --11-18
  • 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 Q3027: November 18 - identity and sense of the item
  2. Wikipedia: November 18 - 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-q3027/spec.json