User talk:209.246.150.146

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It might be possible to use the speed of light as a basis for a unit of metric time.

The speed of light is 299,792,458 meters per second - so the base unit (I'll call it a "tick" for lack of a common term) could be the amount of time it takes light to travel one gigameter - which would be roughly a third of a second (1 second equals 3.3444 ticks)

That would satisfy your first goal (to have an objective measurement, derived from the meter) ... though it does not satisfy your second goal (even numbers for observable phenomena) - a day would be 25.0872 kiloticks and a 365-day year 9.156 megaticks.

But then, to beg the question, are observable phenomena really that important? Water may boil at a nice, even 100 degrees - but every other liquid boils at a non-interger temperature - and what observable phenomenon corresponds to one kilometer or one megagram?

Granted, human beings live their lives in daily, seasonal, and annual cycles (dismissing the month and week, as those are entirely arbitrary), but I see nothing wrong with a 25-kilotick clock and a 9-megatick calendar, aside from having to adjust for "leap" ticks (which is no different from the current standard, with leap seconds and leap days).