Mark Lloyd wrote:


And had multiple units of measurement for the same thing. Units which
are not simply related (as in length: there's feet, inches, yards,
rods, fathoms, angstroms, light years and more), so adding to the
difficulty of obtaining and using measurements.

Metric has ONE unit for each thing, and a set of related prefixes for
large or small multiples of any unit.

Light years don't exist?


WHAT?? The closest I said to that was that the light year is not a
metric unit.

It isn't??
A light year is the distance that light travels in one year. That
distance can be measured in metric or imperial. It's going to go
the same distance.