Timezone: Paris, France

Paris is the hub of Central European Time (CET). For decades in the 19th century, the "Paris Meridian" was a serious rival to the Greenwich Meridian for the title of the world's zero-longitude line.

The Rival Meridian

While the rest of the world moved toward Greenwich in the 1880s, France held out. For years, French maps showed longitude measured from the Paris Observatory. It wasn't until 1911 that France officially adopted Greenwich Mean Time—but even then, they legally defined it as "Paris Mean Time retarded by 9 minutes and 21 seconds."

The BIPM and the Definition of a Second

Paris remains the world's capital for the *measurement* of time. The International Bureau of Weights and Measures (BIPM) is located in Sèvres, just outside Paris. It is here that the world’s atomic clock data is synchronized to create UTC (Coordinated Universal Time).

Daylight Saving and Modernity

France observes Central European Summer Time (CEST), shifting to UTC+2 during the summer. Like much of the EU, they are periodically debating whether to abolish the seasonal shift and stay on permanent summer time.

Conclusion

Paris is where time became a science. Every second you see on the Epoch Clock is ultimately verified and calculated by the instruments sitting just outside the city. It is the place where the "second" was given its formal, universal identity.