> Humans sleep, usually at night time This seems like a kind of navel gazing point, however-- without leapseconds it would take on the order of 4000 years to

> Humans sleep, usually at night time This seems like a kind of navel gazing point, however-- without leapseconds it would take on the order of 4000 years to slip an hour, quite a big longer so that nights hours aren't aren't at night. We already have a good mechenism for matching local sun time-- timezones. I don't see anyting in your post to justify one second level offsets. (aside, UT1 is technically defined in terms of earth's orientation with respect to distant quasars, not the sun :) )