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Specifying a particular meridian when determining the length of a meter is necessary because the meter is defined as one ten-millionth of the distance from the North Pole to the Equator along a meridian. This definition ensures a consistent and reproducible standard for measurement based on Earth's geometry. Different meridians may have slight variations in distance due to the Earth's shape, so using a specific meridian avoids discrepancies in measurement and provides a reliable reference for the meter.

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3w ago

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