https://xkcd.com/2867

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It’s not just time zones and leap seconds. SI seconds on Earth are slower because of relativity, so there are time standards for space stuff (TCB, TGC) that use faster SI seconds than UTC/Unix time. T2 - T1 = [God doesn’t know and the Devil isn’t telling.]

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Technically isn’t the Earth itself a sort of space ship which is orbiting (…a star which is orbiting…) the black hole at the center of the Milky Way galaxy? Not really close enough for time dilation to be a factor, but still.

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