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this post was submitted on 26 Oct 2025
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Proton masses, the distance light travels in a vacuum in a certain time, and cesium oscillation times are quite constant.
proton masses are rather small - inconvenient
the distance light travels at a certain time - then it'll just be based on our artificial units of time
cesium oscillation i don't know much about but from what i quickly read it's also about keeping time, 1s to be precise, which is still an arbitrary unit
Time can be non arbitrarily defined as a round number value of times cesium oscillates between two hyperfine states, to allow time to be non arbitrary and still a useful size.
The round number would still be arbitrary, no? It’s roundness would be based on the base 10 counting system, which is also arbitrary.
Not arbitrary. Base 10 because we usually have 10 fingers and those are useful for learning counting. If you have to choose a base, 10 is a good option for humans.
That's still an arbitrary number to pick, and the choice of cesium oscillation seems pretty arbitrary in the grand scheme of things.