← Back to catalogue
Published

May 27

vr.tr.may-27 · thing-q2587

Let an agent handle May 27 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 May 27 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 May 27 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 May 27, 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 May 27? 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

May 27, day 147 (day 148 in leap years) of the year in the Gregorian calendar, with 218 days remaining in both common and leap years. May 27 is the anniversary of the opening of the Golden Gate Bridge in 1937, of the 1905 Battle of Tsushima, and of the founding of Saint Petersburg on May 27, 1703 Gregorian, corresponding to May 16 Old Style; it also marks Children's Day in Nigeria and the 1967 Australian referendum on Aboriginal rights.

Why it exists Filled

Let an agent handle May 27 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The twenty-seventh day of May
  • 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

  • Give the founding of Saint Petersburg on May 27, 1703 without noting that this is the Gregorian date, corresponding to May 16 Old Style.
  • Present Children's Day in Nigeria as observed everywhere.
  • Report the 1967 Australian referendum without its significance for Aboriginal people.
  • Add on-this-day events without a source.

Only with a human decision

  • Scheduling public commemorations or messages tied to sensitive anniversaries on this date.

May

  • Report May 27 as day 147, or 148 in leap years, of the Gregorian calendar.
  • List sourced events on May 27, such as the 1905 Battle of Tsushima and the 1937 opening of the Golden Gate Bridge.

Moral aspects Filled

  • Anniversaries such as the 1967 referendum matter deeply to the peoples they concern.
  • Errors in date reporting spread quickly in on-this-day lists.

Who is affected

  • Aboriginal and Torres Strait Islander peoples
  • Readers
  • Nigerian children and families

Owners Filled

Steward

Nobody owns a date; the Gregorian calendar is held in common.

Links to other meta-models Filled

parent

  • Q11187356 - registry parent class

related

  • May - month
  • May 26 - 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.may-27
  • Wikidata: Q2587 (https://www.wikidata.org/wiki/Q2587)
  • ISO 8601: --05-27 recurring date

Direct properties not applicable Not applicable

  • day of year: 147 or 148 day - common year, leap year where different
  • days remaining: 218 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 27 May or May 27
  • ISO format --05-27
  • 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 Q2587: May 27 - identity and sense of the item
  2. Wikipedia: May 27 - 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-q2587/spec.json