Among historians, a typical need to is to synchronize the reigns of kings and leaders in order to relate the history of one country or region to that of another. D.) is one of the major works of historical synchronism. The first contains narrative chronicles of nine different kingdoms: Chaldean, Assyrian, Median, Lydian, Persian, Hebrew, Greek, Peloponnesian, Asian, and Roman.

The second part is a long table synchronizing the events from each of the nine kingdoms in parallel columns.

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Radiocarbon dating estimates the age of formerly living things by measuring the proportion of carbon-14 isotope in their carbon content.

Dendrochronology estimates the age of trees by correlation of the various growth rings in their wood to known year-by-year reference sequences in the region to reflect year-to-year climatic variation.

To place all the events on the same time scale, Eusebius used an Anno Mundi (A.

M.) era, meaning that events were dated from the supposed beginning of the world as computed from the Book of Genesis in the Hebrew Pentateuch.

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.

It was used systematically for the first time only about the year 400, by the Iberian historian Orosius.

The last great chronographer was Joseph Justus Scaliger (1540-1609) who reconstructed the lost Chronicon and synchronized all of ancient history in his two major works, De emendatione temporum (1583) and Thesaurus temporum (1606).

Much of modern historical datings and chronology of the ancient world ultimately derives from these two works.

The fundamental problem of chronology is to synchronize events.

By synchronizing an event it becomes possible to relate it to the current time and to compare the event to other events.

Consider, for example, the use of a timeline or sequence of events.