Chronology is the science of locating events in time. An arrangement of events, from either earliest to latest or the reverse, is also called a chronology or, particularly when involving graphical elements, a timeline (for an example see Detailed logarithmic timeline). See also Chronicle.

Unlike chronometry (i.e. timekeeping), which is part of physics, chronology (i.e. arithmetic of time), as the science of localizing historical events in time, is part of history.

The familiar terms ‘era’ (taken as a system of numbered calendar years) and ‘calendar’ concern two complementary fundamental concepts of chronology. So during eight centuries the calendar belonging to the Christian era, which era was taken in use in the eighth century, was the Julian calendar, but after the year 1582 it was the Gregorian calendar. Dionysius Exiguus (about the year 500) was the founder, Beda Venerabilis (about the year 700) was the great promotor of the era which ultimately would be the only one in use mondially. That made them the

A chronology may be either relative -- that is, locating related events relative to each other -- or absolute -- locating these events to specific dates in a Chronological Era. In that these dates are themselves events, the difference between the two blurs a little: An absolute chronology just includes a special sort of event called a date which is common to all absolute chronologies covering the same period of time. Even this distinction may be blurred by use of different calendars; In our culture, historical dates in an absolute chronology are understood to be referred to the Christian era in combination with the Gregorian calendar: Or in theory by relativistic effects.

Other familiar chronological subjects are for example: linear timescale, French revolutionary era, leap year, jewish calendar. Subjects of the Christian chronology are for example: easter table, Paschal full moon, lunar cycle, solar cycle, easter cycle, lunar phase number, millennium question.

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. In the field of Egyptology, William Flinders Petrie pioneered sequence dating to penetrate pre-dynastic

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 study of the means of placing pottery and other cultural artefacts into some kind of order proceeds in two phases, classification and typology: Classification creates categories for the purposes of description, and typology seeks to identify and analyse changes that allow artefacts to be placed into sequences .

An increasing battery of laboratory techniques developed particularly after mid-20th century helped constantly revise and refine the chronologies developed for specific cultural areas. Unrelated dating methods help reinforce a chronology, an axiom of corroborative evidence. Ideally, archaeological materials used for dating a site should complement each other and provide a means of cross-checking. Conclusions drawn from just one unsupported technique are usually regarded as unreliable.

Bayesian analysis has recently started to be routinely applied in the analysis of chronological information, including radiocarbon-derived dates,

Though chronologies formulated before the 1960s are subject to serious skepticism today, more recent results are more robust than readily appears to journalists and enthusiastic amateurs.

See also

Chronologies

• Centuries
• Chronology of the Ancient Orient
• Chronology of Babylonia and Assyria
• Egyptian chronology
  • Conventional Egyptian chronology
• Timeline of Chinese history
• Phoenician chronology
• Mesoamerican chronology
• Timeline of Jewish history
• Timeline of Christianity
• Medieval chronological timeline
• Vedic timekeeping
• Chronological dates in Tamil history
• Tamil chronometry
• Japanese era name
• Holocene calendar
• SriLankan chronicle

Techniques

• Dendrochronology counts growth rings in timber, and correlates patterns
• Radiocarbon dating
• Thermoluminescence measures when objects were last heated

Other

• Chronological order

Further reading

• M. Aitken, Science-Based dating in Archaeology (Thames and Hudson, London) 1990: a recent overview
• P. Warren and V. Hankey, Aegean Bronze Age Chronology. Bristol, 1989.
• S. W. Manning, The Absolute Chronology of the Aegean Early Bronze Age: Archaeology, Radiocarbon, and History. Sheffield, 1995. Kronologi

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