Epoch (reference date)
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In the fields of
Events taking place before the epoch can be dated by counting negatively from the epoch, though in pragmatic
Epochs are generally chosen to be convenient or significant by a consensus of the time scale's initial users, or by authoritarian fiat. The epoch moment or date is usually defined by a specific clear event, condition, or criterion—the epoch event or epoch criterion—from which the period or era or age is usually characterized or described.