I take my hat off to those who have to measure to extreme accuracies.
I came across slightly long winded but interesting paper on a US website that shows just what a bugger it is.
Imagine having to allow for the number of people in the measuring room because their breath increases humidity which changes the air’s refractive index.
I also came across this paper, which by my quick and unreliable calculation means the USA will get about 40 feet wider once the US government has fully redefined the yard.
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I will keep it that way for as long as possible.