themaninblack@lemmy.world to memes@lemmy.world · 1 day agoMiss himlemmy.worldimagemessage-square69fedilinkarrow-up1581arrow-down114
arrow-up1567arrow-down1imageMiss himlemmy.worldthemaninblack@lemmy.world to memes@lemmy.world · 1 day agomessage-square69fedilink
minus-squareTonyTonyChopper@mander.xyzlinkfedilinkarrow-up3·6 hours 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