"Koobee Wublee" wrote in message
...
On Feb 7, 2:23 am, "Paul B. Andersen" wrote:

Any observation where the spectral lines are shifted.
Which they are to some degree in most observed spectra.
A diffraction grating spectrometer measures wavelength.

Thanks for bringing up what I want the Jackal to bring up.

These spectral lines only tell the frequency shift

Wrong .. when tested with a grating they show wavelength .. really, olearn
some physics

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