International Meridian Conference — 1884 conference in Washington, D.C., United States
Established Greenwich as the international prime meridian, standardizing global longitude and time reckoning.
Key Facts
- Date
- October 1884
- Host city
- Washington, D.C., United States
- Convened by
- U.S. President Chester A. Arthur
- Outcome
- Greenwich Meridian recommended as 0° longitude
- Purpose
- Select a universal prime meridian and time standard
Location
Cause → Event → Consequence
By the late nineteenth century, the expansion of global trade, navigation, and railways created an urgent need for a universally agreed prime meridian. Different nations used different reference points for longitude and time, causing confusion in cartography, navigation, and scheduling across borders.
In October 1884, representatives from numerous nations convened in Washington, D.C., at the invitation of U.S. President Chester A. Arthur. The conference debated which meridian should serve as the common zero of longitude and the basis for global time reckoning, with multiple candidates under consideration.
The conference recommended the Greenwich Meridian, passing through the Royal Observatory in England, as the international standard for zero degrees longitude. This decision laid the groundwork for the modern system of world time zones and standardized navigation charts used globally thereafter.