45 Million Years of Accuracy

45 Million Years of Accuracy. IWC's first secular perpetual calendar took into account the complex leap year rules of the Gregorian calendar and was so precise…

Location: IWC Museum, Schaffhausen, Switzerland

Category: weird

IWC's first secular perpetual calendar took into account the complex leap year rules of the Gregorian calendar and was so precise that it would only deviate by one day after 45 million years.

Source: International Watch Company

45 Million Years of Accuracy — Schaffhausen, Canton of Zurich

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