To make the past more understandable, people around the world began counting years. We use the Christian calendar. Because Christianity had become so important, it was decided in AD 527 to use the birth of Christ as the starting point. All years are counted from this starting point (addition). For everything that happened before this starting point, you have to count backward. The last year before the starting point is 1 BC (Before Christ); the birth of Christ is the zero point. The year zero does not exist! The first year after the starting point is therefore AD 1 (Anno Domini).

You should always set up a timeline generously so that it remains clear and organized. The proportions must be accurate, so it is useful to use a ruler. Indicate the start and end years, as well as the zero point (if it is included). The years after Christ should be added, and the years before the zero point should be counted backward.