International Meridian Conference
E21824
The International Meridian Conference was an 1884 gathering of nations in Washington, D.C., that established the Greenwich meridian as the international prime meridian and laid the foundation for global time standardization.
All labels observed (2)
| Label | Occurrences |
|---|---|
| International Meridian Conference canonical | 3 |
| International Meridian Conference of 1884 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T170456 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: International Meridian Conference Context triple: [Greenwich Mean Time, standardizedAt, International Meridian Conference]
-
A.
San Francisco Conference
The San Francisco Conference was the 1945 international gathering where delegates from 50 nations drafted and signed the United Nations Charter, leading to the creation of the UN.
-
B.
ITU Plenipotentiary Conference
The ITU Plenipotentiary Conference is the top policy-making body of the International Telecommunication Union, where member states set the Union’s strategic direction, budget, and leadership.
-
C.
Dumbarton Oaks Conference
The Dumbarton Oaks Conference was a 1944 diplomatic meeting in Washington, D.C., where major Allied powers drafted the foundational proposals that led to the creation of the United Nations.
-
D.
Imperial Economic Conference agreements
The Imperial Economic Conference agreements were a series of 1932 trade arrangements within the British Empire that established a system of imperial preference, granting mutual tariff advantages to promote intra-Empire commerce during the Great Depression.
-
E.
Council of the League of Nations
The Council of the League of Nations was the principal executive and decision-making body of the League, composed of major powers and rotating member states to address international disputes and security issues.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: International Meridian Conference Target entity description: The International Meridian Conference was an 1884 gathering of nations in Washington, D.C., that established the Greenwich meridian as the international prime meridian and laid the foundation for global time standardization.
-
A.
San Francisco Conference
The San Francisco Conference was the 1945 international gathering where delegates from 50 nations drafted and signed the United Nations Charter, leading to the creation of the UN.
-
B.
ITU Plenipotentiary Conference
The ITU Plenipotentiary Conference is the top policy-making body of the International Telecommunication Union, where member states set the Union’s strategic direction, budget, and leadership.
-
C.
Dumbarton Oaks Conference
The Dumbarton Oaks Conference was a 1944 diplomatic meeting in Washington, D.C., where major Allied powers drafted the foundational proposals that led to the creation of the United Nations.
-
D.
Imperial Economic Conference agreements
The Imperial Economic Conference agreements were a series of 1932 trade arrangements within the British Empire that established a system of imperial preference, granting mutual tariff advantages to promote intra-Empire commerce during the Great Depression.
-
E.
Council of the League of Nations
The Council of the League of Nations was the principal executive and decision-making body of the League, composed of major powers and rotating member states to address international disputes and security issues.
- F. None of above. chosen
Statements (58)
| Predicate | Object |
|---|---|
| instanceOf |
diplomatic conference
ⓘ
international conference ⓘ |
| appliesTo |
cartography
ⓘ
global navigation ⓘ global timekeeping ⓘ |
| chairperson | Lewis M. Rutherfurd ⓘ |
| city | Washington, D.C. ⓘ |
| convenedBy | United States of America ⓘ |
| country | United States of America ⓘ |
| definedConcept |
Greenwich Mean Time
ⓘ
Prime Meridian ⓘ
surface form:
international prime meridian
universal day ⓘ |
| endDate | 1884-10-22 ⓘ |
| field |
astronomy
ⓘ
geodesy ⓘ navigation ⓘ timekeeping ⓘ |
| followedBy | development of international standard time zones in the late 19th century ⓘ |
| historicalPeriod | late 19th century ⓘ |
| hostedBy | United States of America ⓘ |
| inception | 1884 ⓘ |
| language | English ⓘ |
| location | Washington, D.C. ⓘ |
| mainSubject |
longitude
ⓘ
prime meridian ⓘ time standardization ⓘ |
| name | International Meridian Conference self-link ⓘ |
| numberOfParticipatingCountries | 25 ⓘ |
| participatingEntity |
Brazil
ⓘ
Chile ⓘ China ⓘ Costa Rica ⓘ Denmark ⓘ Dominican Republic ⓘ France ⓘ Germany ⓘ Italy ⓘ Japan ⓘ Mexico ⓘ Netherlands ⓘ Ottoman Empire ⓘ Portugal ⓘ Russia ⓘ Dominican Republic ⓘ
surface form:
San Domingo
Spain ⓘ Sweden ⓘ
surface form:
Sweden-Norway
United Kingdom of Great Britain and Ireland ⓘ United States of America ⓘ Venezuela ⓘ |
| purpose |
to establish a universal day
ⓘ
to promote global time standardization ⓘ to select a single prime meridian for international use ⓘ |
| result |
adoption of the Greenwich meridian as the international prime meridian
ⓘ
foundation for international standard time zones ⓘ recommendation of a universal day beginning at midnight at Greenwich ⓘ |
| secretary | Cleveland Abbe ⓘ |
| significantPlace |
Maritime Greenwich
ⓘ
surface form:
Greenwich Observatory
|
| startDate | 1884-10-01 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: International Meridian Conference Description of subject: The International Meridian Conference was an 1884 gathering of nations in Washington, D.C., that established the Greenwich meridian as the international prime meridian and laid the foundation for global time standardization.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
International Meridian Conference of 1884