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T

In article ,
says...
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.

Yes it can be measured using both, but traditional usage in the
scientific community has always been metric.