themaninblack@lemmy.world to memes@lemmy.world · 1 month agoMiss himlemmy.worldexternal-linkmessage-square70fedilinkarrow-up1611arrow-down113
arrow-up1598arrow-down1external-linkMiss himlemmy.worldthemaninblack@lemmy.world to memes@lemmy.world · 1 month agomessage-square70fedilink
minus-squareTonyTonyChopper@mander.xyzlinkfedilinkarrow-up4·1 month ago After the 2019 revision of the SI, this definition [of the metre] was rephrased to include the definition of a second in terms of the caesium frequency ΔνCs. https://en.wikipedia.org/wiki/Metre
Wait, what changed in 2019?
https://en.wikipedia.org/wiki/Metre