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@simon_brooke @catgirlQueer @vashti

Fun fact:

Until 1972-01-01Z we used rubber-time, because astrometry is not nearly as constant as most people seem to think.

But it is worse than that.

We literally have no idea how long nanoseconds took before 1958-01-01Z

If you go back before observations of solar eclipses, we even barely know how long days took.

Any epoch before 1972-01-01Z by defintion causes wrong timekeeping.