I went to my local planetarium recently and learnt that the earth to moon distance increases by 38mm each year, while the earth rotation slows down very slightly. Obviously not a significant amount to mean anything right now, but what will happen in the future when it will make a difference? How will people just “add time” to hours/days/weeks/months and so forth?
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Most likely the same way we do now. The earth takes 365 days and a bit for a year. So every four years that extra bit adds up to a full day and so we just have an extra day in February. Until the extra time is significant, it will be ignored until it can be added up to make an extra period of time. So we will probably just have a permanent 29th Feb and then maybe a 30th every three years or something. It would be too chaotic trying to add it in smaller increases.
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