themaninblack@lemmy.world to memes@lemmy.world · 23 days agoMiss himlemmy.worldimagemessage-square67linkfedilinkarrow-up11arrow-down10
arrow-up11arrow-down1imageMiss himlemmy.worldthemaninblack@lemmy.world to memes@lemmy.world · 23 days agomessage-square67linkfedilink
minus-squareTonyTonyChopper@mander.xyzlinkfedilinkarrow-up0·22 days 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