International Conference Held at Washington for the Purpose of Fixing a Prime Meridian and a Universal Day. October, 1884.

On October 1, 1884, diplomats, astronomers, and engineers from dozens of nations gathered in Washington’s Diplomatic Hall for a historic meeting. Invited by the United States, they came to decide on a single line of longitude and a standard world clock that could unify time‑keeping across continents. The roll call reads like a world tour—representatives from Austria‑Hungary, Brazil, France, Japan, Russia and many more fill the room, each bearing the weight of their country’s scientific and commercial interests.

The opening remarks, delivered by Secretary of State Frederick T. Frelinghuysen, set a tone of cooperation and optimism, urging the delegates to forge a solution that would serve the “civilized world.” As the conference proceeds, the participants exchange data from observatories, railways, and naval stations, highlighting how a common meridian could simplify navigation, telegraphy, and daily life. Listeners will hear the careful negotiations, the blend of scientific rigor and diplomatic etiquette, and the early steps toward the global time system we now take for granted.