Re: Astronomical coordinates

At the accuracy that most distances measured in light years are known. I'm
surprised that it matters which 'year' is used. I'd also be surprised if a
light year is not a defined distance rather than calculated from c. and and
an earth year, and therefore subject to revision at each redefinition of
those units. 'Light years', though a perfectly good unit, are a basically
amateur unit, anyway. Professionals tend to use parsecs (Another geocentric
unit!)

Roger


.

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