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> TAI is completely perfect down to the picosecond level and further.

I may have worded it badly, let's try again: TAI is "completely perfect" for the approximation it is: time elapsed at the geoid, which is a theoretical construct. That's an approximation for both "experienced time" and for anything which could be called "absolute time"

Oh that's easy to solve. Just mandate everyone live at sea level.

And stop the Earth from spinning, so we can get rid of that pesky oblateness and gravitational delta between the equator and poles.

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