On another board, during some discussion of relativity,
it was claimed that a test of relativistic Doppler shift
could be performed via frequency combs (a recent tool)
and diffraction gratings; i.e. v = fλ
Then, someone objected, dismissing the argument as
circular, since the diffraction grating model itself
depends on assuming a constant speed of light, c, as
per Einstein's second postulate.
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