International Meridian Conference

The International Meridian Conference was a conference held in October 1884 in Washington, D.C., in the United States, to determine a prime meridian for international use. The conference was held at the request of U.S. President Chester A. Arthur. The subject to discuss was the choice of "a meridian to be employed as a common zero of longitude and standard of time reckoning throughout the world". It resulted in the recommendation of the Greenwich Meridian as the international standard for zero degrees longitude.

International Meridian Conference
The vertical red line left of the middle is the Greenwich meridian.
Host country United States
Date1 October 1884 (1884-10-01)
CitiesWashington, D.C.
ChairC. R. P. Rodgers
Key points
  • Establishment of Universal Time
  • Agreement of the Greenwich meridian as the international standard for 0° longitude
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