But that’s essentially how it works right now. The SI second is defined as some arbitrary number of state transitions of a cesium atom. The arbitrary number was originally chosen because it aligned with a fraction of a solar day, but nobody is changing the arbitrary number to account for the changing rotation of the Earth. That part of the problem is handled by the UTC, which keeps atomic time (as measured by TAI) synchronized with astronomical time by occasionally inserting leap seconds, so that us mortals may continue to pretend that our clocks and calendars accurately describe natural cycles.
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