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It relies upon chronometry, which is also known as timekeeping, and historiography, which examines the writing of history and the use of historical methods.
Radiocarbon dating estimates the age of formerly living things by measuring the proportion of carbon-14 isotope in their carbon content.
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.
Pope Boniface IV, in about the year 600, seems to have been the first who made a connection between these this era and Anno Domini.
In the field of Egyptology, William Flinders Petrie pioneered sequence dating to penetrate pre-dynastic Neolithic times, using groups of contemporary artefacts deposited together at a single time in graves and working backwards methodically from the earliest historical phases of Egypt. Known wares discovered at strata in sometimes quite distant sites, the product of trade, helped extend the network of chronologies.
Some cultures have retained the name applied to them in reference to characteristic forms, for lack of an idea of what they called themselves: "The Beaker People" in northern Europe during the 3rd millennium BCE, for example.
The second part is a long table synchronizing the events from each of the nine kingdoms in parallel columns.
The image to the right shows two pages from the second section.
Subsequent chronographers, such as George Syncellus (died circa 811), analyzed and elaborated on the Chronicon by comparing with other chronologies.