Yet another reason no system not dealing with high-precision time-synchronized physical measurements should ever touch leap seconds.https://twitter.com/dgryski/status/815811732501393408 …
Perhaps "linear" is underspecified and you have some idea of "linear" that I don't.
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Time as a physically invariant quantity only makes sense within a single inertial frame. Using SI secs (TAI) to coordinate...
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...human activity across different frames by declaring one canonical is completely arbitrary, not "more correct".
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The only things that matter are continuity, monotonicity, local uniformity, and having _a_ common reference time.
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I guess "linearity" is what you'd call "global uniformity". A TAI second is the same no matter when it happens. I like that.
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This uniformity only exists in the reference frame of the authority; it's not valid in the reference frames where you use it.
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I suspect we seriously misunderstand each other. How is the SI definition of a second invalid anywhere?
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The SI definition of a second is (presumably) locally-valid anywhere, but TAI is not your inertial frame's local SI second.
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TAI is a synchronization (via measurement & published offsets) of SI seconds in a multitude of reference frames.
End of conversation
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