“经度问题”是18世纪最棘手的科学难题。在将近两个世纪的时间里，科学家们费尽心机，想找到一种解决方案。当时，整个欧洲的科学界——从伽利略到牛顿——都试图通过绘制天体图，从天空中找到解决方案。而钟表匠约翰·哈里森却独树一帜，大胆地提出了用机械方法(即使用一种能在海上提供精确时间的钟表)来解决该问题。他四十年如一日地潜心制作了后来被称作“精密时计”的完美计时器。

Who invented time, who invented the clock? Why 1 hour, why 60 minutes, why 60 seconds? Since prehistoric times, man has sought to measure time, to organize social and religious life, to plan food supply... Today we can surf the Internet, geolocate, pay by credit card… All our daily lives depend on time and the synchronization of clocks. The history of the invention of time and of the ways and instruments to measure it is a long story…