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In a stratigraphical context objects closer to the surface are more recent in time relative to items deeper in the ground.

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’.

The Long Count calendar consists of five time units: Bak'tun (144,000 days); K'atun (7,200 days), Tun (360 days), Winal (20 days) and K'in (one day).

The time is counted from a mythical starting point. Spanish colonisers did their utmost to wipe out traces of the Mayan civilisation, destroying evidence that could have provided a clue.

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.

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The Mayan calendar used 3114 BC as their reference.

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