On Sunday, 4 March 2018 22:16:09 UTC, Gareth Magennis wrote:

OK, I'm no Physisyst, though I quite liked Physics at school and was
reasonably good at it.

Is it not now considered that time is no longer arbitrary?
i.e. Atomic clocks base a second around the determinable decay of some kind
of (cesium) radioactive particle?

This is not a variable under normal earth conditions.

but the unit of seconds is an arbitrary number of decays.


NT