While of critical importance to the historian, methods of determining chronology are used in most disciplines of science, especially astronomy, geology, paleontology and archaeology.
In the absence of written history, with its chronicles and king lists, late 19th century archaeologists found that they could develop relative chronologies based on pottery techniques and styles.
Much of modern historical datings and chronology of the ancient world ultimately derives from these two works.
The image to the right shows two pages from the second section.
is the science of arranging events in their order of occurrence in time.
Consider, for example, the use of a timeline or sequence of events.
Modern historians use it much more frequently than the Romans themselves did; the dominant method of identifying Roman years was to name the two consuls who held office that year.
Before the advent of the modern critical edition of historical Roman works, AUC was indiscriminately added to them by earlier editors, making it appear more widely used than it actually was.