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Published

July 20

vr.tr.july-20 · thing-q2728

Let an agent handle July 20 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 July 20 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 July 20 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 July 20, 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 July 20? 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

July 20, day 201 (day 202 in leap years) of the year in the Gregorian calendar, with 164 days remaining in both common and leap years. July 20 is Independence Day in Colombia marking 1810, International Chess Day marking the founding of FIDE in 1924, the anniversary of the Apollo 11 lunar landing in 1969, of the failed plot to assassinate Hitler in 1944, and of the start of the 1974 Turkish military operation in Cyprus, which Turkey calls a peace operation and Cyprus and Greece describe as an invasion.

Why it exists Filled

Let an agent handle July 20 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The twentieth day of July
  • 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 Colombian Independence Day as a holiday in other countries.
  • Give on-this-day facts without a source.
  • Mix Julian and Gregorian dates for historical events on July 20.

Only with a human decision

  • Fixing official or contractual deadlines in a country where it is a public holiday.

May

  • Compute the weekday and day of year for July 20 in a given year.
  • List observances such as Colombian Independence Day and International Moon Day, naming who keeps them.

Moral aspects Filled

  • National days carry historical memory for the people who observe them.
  • Wrong dates can disrupt travel and legal deadlines.

Who is affected

  • People of Colombia
  • People with deadlines that day

Owners Filled

Steward

Nobody owns a date; each observance belongs to the state or body that keeps it.

Links to other meta-models Filled

parent

  • Q11187215 - registry parent class

related

  • July - month
  • July 19 - 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.july-20
  • Wikidata: Q2728 (https://www.wikidata.org/wiki/Q2728)
  • ISO 8601: --07-20 recurring date

Direct properties not applicable Not applicable

  • day of year: 201 or 202 day - common year, leap year where different
  • days remaining: 164 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 20 July or July 20
  • ISO format --07-20
  • 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 Q2728: July 20 - identity and sense of the item
  2. Wikipedia: July 20 - 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-q2728/spec.json