Summary
They chose to use the distance between the Earth’s north and south poles.
Since then, scientists have updated the meter many times.
Key Points
3 points1
1793: France set the first official length for a meter.
2
The original meter was based on the Earth’s meridian.
3
Scientists have refined the meter’s definition many times.
New Words to Learn
6 wordsmeter
A way to measure length, about as long as a big ruler.
decimal system
A way of counting that uses ten as the base, like 1, 2, 3…
meridian
An imaginary line that runs from the North Pole to the South Pole.
definition
A clear description of what something means.
National Assembly
A group of leaders who make important decisions for a country.
affirmed
Officially said something is true or correct.
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