…which is based on seconds, which is based on ??? IDFK (neither would they)
“The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical
value of the caesium frequency, ΔνCs, the unperturbed ground-state hyperfine
transition frequency of the caesium 133 atom, to be 9 192 631 770 when expressed in the
unit Hz, which is equal to s−1.”
https://www.bipm.org/en/si-base-units/second
I don’t think that was the idea when the second was created.
The solar rotation cycle is naturally divided into 365 rotations of Earth (give or take), each daily rotation was divided into 24 segments called hours, each hour was further divided into 60 units called minutes, and each minute was then further divided into 60 units which we call seconds.
In the modern era, we have refined how we measure a second by a very stable natural phenomenon, the emissions of cesium (which we also refer to as an “atomic” clock). But we got there first by dividing one of Earth’s rotations by 86400. It just so happens that 9 192 631 770 oscillations from cesium also equals 1/86400th of one rotation of Earth.
Additionally, neither a “second” nor even “one rotation of Earth” would have any meaning to someone who has never been to earth before.
It doesn’t matter how these units were originally defined. They have all been redefined as science progressed. As long as you relate the arbitrary unit to a constant it can be translated.
“The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical value of the caesium frequency, ΔνCs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s−1.” https://www.bipm.org/en/si-base-units/second
I don’t think that was the idea when the second was created.
The solar rotation cycle is naturally divided into 365 rotations of Earth (give or take), each daily rotation was divided into 24 segments called hours, each hour was further divided into 60 units called minutes, and each minute was then further divided into 60 units which we call seconds.
In the modern era, we have refined how we measure a second by a very stable natural phenomenon, the emissions of cesium (which we also refer to as an “atomic” clock). But we got there first by dividing one of Earth’s rotations by 86400. It just so happens that 9 192 631 770 oscillations from cesium also equals 1/86400th of one rotation of Earth.
Additionally, neither a “second” nor even “one rotation of Earth” would have any meaning to someone who has never been to earth before.
It doesn’t matter how these units were originally defined. They have all been redefined as science progressed. As long as you relate the arbitrary unit to a constant it can be translated.