Cecil Moore wrote:

We often infer that a frequency has lessened due to
the red shift which could certainly be a shortening
of a second from the time the light was generated
until now.

The phenomenon of red shift is readily observable - that's how it was
discovered. Line spectra from known elements is observed to be
shifted in wavelength down from where it appears in the rest frame.
The cause could be doppler shifting due to relative motion, or some
other reason. If the length of the second were different, then so
would be the speed of light as well as the constant of proportionality
between frequency and wavelength at the source. In fact all kinds of
physics would have to be different. There is certainly a probability
for either case. Whether the probabilities are of the same magnitude
is debatable.

73 de ac6xg