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Do not lend the past tomorrow's knowledge
An anachronism places something in the wrong historical time.
The idea
Using later technology or information to explain earlier decisions can distort what people could actually know or do.
An example
Judging an old voyage as if its crew had satellite forecasts assigns them tools they never possessed.
Put it into practice
Separate knowledge available then from knowledge available now.
Further reading: Library of Congress · Historical Thinking ↗
Test yourself: Which judgement contains an anachronism?
Expecting an eighteenth-century crew to use satellite forecasts
Satellite forecasting belongs to a later period.
Explanation and illustrative examples by One Card Wiser. Source linked for further reading.
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