themaninblack@lemmy.world to memes@lemmy.world · 3 days agoMiss himlemmy.worldimagemessage-square59fedilinkarrow-up1505arrow-down112
arrow-up1493arrow-down1imageMiss himlemmy.worldthemaninblack@lemmy.world to memes@lemmy.world · 3 days agomessage-square59fedilink
minus-squareTonyTonyChopper@mander.xyzlinkfedilinkarrow-up3·2 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