Erin 💽✨Remember: If a "second" is 1/86400th of a day, its UT1
If a "second" 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 9192631770 when expressed in the unit Hz, which is equal to s−1", its UTC/TAI.
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