We can see the rooms and thus the distances with the naked eye. But what about time? It remains, at first, something abstract, difficult to grasp. And yet man has succeeded in determining the time to the nanobearch. How was it possible to penetrate into such exact spheres? What evolutionary steps had time-gauges on the way to the omnipresent wristwatch, and what great personalities were driving the history of mechanical timekeeping? We would like to address these and similar questions in the article series “In the Beginning of Time”. Read in the first part how the time measurement developed from observing the stars and a shadow to the first pocket watch.