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meridian

vr.tr.meridian · thing-q32099

Let an agent explain meridians, relay geodesy, history, the prime meridian and surveying uses from geodetic and historical sources, describe the named meridian types, and distinguish meridians from parallels, time zones, the celestial meridian and traditional Chinese medicine meridians.

Thing Registry Cross-cutting context XCT.QLT
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

Understand What a meridian is.

Definition

Definition.

Definition

Definition.

  1. What is a meridian, and how does it differ from parallels, time zones, the celestial meridian and TCM meridians? definition
  2. Is the question about geography, surveying, astronomy or traditional medicine? boundary

Types

Named types.

Types

Types.

  1. What are the prime meridian, principal meridians and meridian markers? definition
  2. Which entry fits the specific meridian? action
Geodesy Geodesy.

Longitude

Longitude.

Longitude

Longitude.

  1. How is longitude defined and measured? measurement
  2. Which references are standard? provenance

IERS

Reference meridian.

IERS

IERS.

  1. Why does the GPS zero meridian lie east of the Greenwich line? provenance
  2. Which sources are cited? provenance
History History.

Conference

1884 conference.

Conference

Conference.

  1. How was Greenwich chosen in 1884, and which countries objected? provenance
  2. Which entry fits International Meridian Conference? action

Surveying

Survey meridians.

Surveying

Surveying.

  1. How are principal meridians used in land surveys? provenance
  2. Which entry fits Public Land Survey System? action
Context Other senses.

Astronomy

Celestial meridian.

Astronomy

Astronomy.

  1. What is the celestial meridian and meridian transit? provenance
  2. Which entry fits meridian (astronomy)? action

Traditional medicine

TCM meridians.

Traditional medicine

Traditional medicine.

  1. What are meridians in traditional Chinese medicine, and what does scientific evidence say, with positions attributed? provenance
  2. Which entry fits meridian (Chinese medicine)? action

Classifiers Filled

Family
Thing Registry
Category
Cross-cutting context
Entry kind
thing
Plane
XCT
Domain
XCT.QLT
Other names and narrower kinds
meridian marker, prime meridian, principal meridian

What it is Filled

In geography, a meridian or line of longitude is half of a great circle on the Earth s surface running from the North Pole to the South Pole, connecting points of equal longitude, measured east or west from the prime meridian, internationally agreed at Greenwich in 1884 and today realised as the IERS Reference Meridian about 102 metres east of the Greenwich transit circle; surveying systems use principal meridians, such as those of the US Public Land Survey System, and meridian markers show meridian lines on the ground. The term also names the celestial meridian in astronomy and, in traditional Chinese medicine, proposed energy channels, a distinct concept.

Why it exists Filled

Let an agent explain meridians, relay geodesy, history, the prime meridian and surveying uses from geodetic and historical sources, describe the named meridian types, and distinguish meridians from parallels, time zones, the celestial meridian and traditional Chinese medicine meridians.

Distinguishing features Filled

  • Pole to pole
  • Longitude reference
  • Historical conventions
  • Several meanings

What robots and AI may and may not do Filled

Must not

  • Mix coordinates from different datums or prime meridians without saying so.
  • Present the Greenwich meridian as the only prime meridian ever used.
  • Confuse the geographic meridian with meridians in traditional medicine or astronomy.
  • Give positions for navigation without stating their accuracy.

Only with a human decision

  • Fixing disputed boundaries that follow a meridian.

May

  • State the longitude of a meridian and convert between coordinate formats.
  • Use meridians for navigation and mapping with the stated datum.

Moral aspects Filled

  • Navigation errors from wrong coordinates can put ships and aircraft at risk.
  • Boundaries drawn on meridians often ignored people living there.

Who is affected

  • Navigators
  • Map users
  • People living on drawn boundaries

Owners Filled

Steward

Nobody owns it; geodetic authorities define reference systems.

Links to other meta-models Filled

parent

  • Q27096213 - registry parent class
  • Q91347380 - registry parent class

related

  • half of great circle - in registry terms
  • longitude
  • prime meridian
  • circle of latitude

What else AI and robots need to interact with it Filled

Identity and identifiers required Filled

  • Vercy registry: vr.tr.meridian
  • Wikidata: Q32099 (https://www.wikidata.org/wiki/Q32099)

Direct properties not applicable Not applicable

  • International Meridian Conference: 1884 year - Washington
  • IERS Reference Meridian offset: about 102 m - east of Airy transit circle
  • longitude range: 180 degrees east and west note

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Line of constant longitude from pole to pole
  • Meridian marker, prime meridian, principal meridian
  • Parallels are lines of latitude; time zones follow political boundaries; the celestial meridian is in the sky; TCM meridians are a medical tradition concept
  • Lines running north-south on maps and globes; sometimes marked on the ground by plaques or lines.

Capabilities and actions required Filled

  • explain geodesy
  • relay history of the prime meridian
  • describe named meridian types
  • distinguish other senses

Hazards and failure modes required Filled

  • Confusing the Greenwich line and the IERS meridian
  • Confusing meridians and time zones
  • Presenting TCM meridians as anatomical structures

Standards and interfaces required Filled

  • International Earth Rotation and Reference Systems Service conventions
  • WGS 84
  • US Public Land Survey System

Context of use required Filled

  • Defining longitude and position.
  • prime meridian
  • antimeridian
  • principal survey meridians
  • national historical prime meridians such as Paris
  • celestial meridian

Sources Filled

  1. Wikidata item Q32099: meridian - identity and sense of the item
  2. Wikipedia: Meridian (geography) - general description of the item

Open questions

  • Should the principal meridian be a separate entry?
  • How should geodetic sources be linked?
  • Should TCM meridians be disambiguated?

Machine files

Card as JSON Specification Card backlog vercy.card/1

Provenance

thing registry research (pass 2) · unreviewed

Built from: models/things/publications/thing-q32099/spec.json