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Re: unit system??

My students were measuring reaction times today using the
well known free-falling ruler method. At first the reaction
time was in cm; then they converted it into s. The mean
value for 40 people turned out to be 0.20 s. This was
better than last year. Nothing profound; it is the opposite
of expressing distances in time units.
Ludwik Kowalski

Herbert H Gottlieb wrote:

No. A lightyear is not a metrci unit in the cgs, MKS
fps or in any other currently popular syatem favored
by most physicists.

It is used by astronomers in their own system of
parsecs, right angle ascensions, declinations,
orbits, orbitals, magnitudes, oblate spheroids,
and black holes.