themaninblack@lemmy.world to memes@lemmy.world · 21 days agoMiss himimagemessage-square70linkfedilinkarrow-up1611arrow-down112
arrow-up1599arrow-down1imageMiss himthemaninblack@lemmy.world to memes@lemmy.world · 21 days agomessage-square70linkfedilink
minus-squareTonyTonyChopper@mander.xyzlinkfedilinkarrow-up4·20 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