Everyone wants their watch to be accurate, and moreover, nowadays everyone expects it. But just how hard is it to make an accurate watch, and what makes a watch accurate in the first place? In this lecture, we’ll look at how and why precision timekeeping evolved, from the earliest water clocks, through the evolution of pendulum clocks, the first watches, marine chronometers, and on down to today’s precision wristwatch. On the way, we’ll keep in mind – as we explore how the modern watch has been shaped by nearly a thousand years of technological and scientific exploration – certain fundamentals in mechanics and physics, and how the ancient enemies of accuracy are still fought on a daily basis by watchmakers today. And we’ll also look at how and why it is that accuracy isn’t just interesting intellectually – we’ll explore how it has a romance all its own.