this post was submitted on 23 Mar 2025
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So I did some digging and the use of 1-second pendulum as a unit of length predates the metre by about a century. It's very possible it informed the choice of ratio to use when defining it properly, like we did with the recent definition change.
It's all on Wikipedia if you want to dive in yourself.
that sounds about right. About what i expected, i'll have to do some reading sometime i suppose.