please empty your brain below
"... and so the line lives on". A bit fingernail-clinging, perhaps, since that is no longer the definition of the metre, and anyway nearby meridians (e.g. the Greenwich one) would probably be the same length to within the accuracy possible back then.
Come to think, it probably never was the definition of the metre, which was originally a specific piece of brass. The piece of brass was made to be as close as they could get to one ten-millionth of what you said.
dg writes: Platinum.
The earth is not a perfect sphere.....
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