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But other timekeeping methods exist and are still used in the modern world, circumventing the easy processing of dates and history between cultures.

Throughout history, time has been defined in a variety of ways: by everything from the current ruler, or empire, or not defined at all.

Radiometric dating methods detect beta particles from the decay of carbon 14 atoms while accelerator mass spectrometers count the number of carbon 14 atoms present in the sample.

Both carbon dating methods have advantages and disadvantages.

Chances are, right now, you have a Gregorian calendar stuck to your wall.

This calendar, with the months January through December, is a business standard used in many places round the world to define the year: one which hearkens back to Christian and Roman Imperial precedents.

Typically (6): The above list is not exhaustive; most organic material is suitable so long as it is of sufficient age and has not mineralised - dinosaur bones are out as they no longer have any carbon left.Not only that, we top up our carbon-14 levels every time we eat.And plants top up their radioactive carbon every time they turn carbon dioxide to food during photosynthesis.These various chronologies and their inherent inconsistencies, known as ‘relative dates,’ are a constant series of hurdles in the quest of historians and archaeologists to record mankind’s existence on earth.However, in the 1940s, the organization of time was transformed by the revelation of radiometric dating and the subsequent creation of a scientific chronology of humankind, known as ‘absolute dating’.

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