Koobee Wublee wrote:
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. It says nothing
about the speed and the wavelength. As you know, speed = frequency *
wavelength. Thus, the spectral shift does not invalidate Doppler/
Maxwell's model of classical Doppler shift --- with constant
wavelength but varying speed and frequency. However, to out-guess
what the happy professor might respond, you are going to toss in the
null results of the MMX. Well, does it really indicate invariance in
the speed? Could Voigt be wrong with all others plagiarizing from him
(without giving him any credit)?

Your out-guess is wrong.

My response is:
A diffraction grating spectrometer measures the wavelength.

lambda = d sin(phi) where d is the grating period.

The spectral lines only tell the wavelength shift.
It says nothing about the speed and the frequency.

It is experimentally proved that wavelength is Doppler shifted.

--
Paul

http://home.c2i.net/pb_andersen/