In future physics, the false axiom

"The speed of light is invariable"

will be replaced with the correct one

"The wavelength is invariable"

This means that, in accordance with the formula

(frequency) = (speed of light)/(wavelength)

any registered change in frequency corresponds to a proportional change in the speed of light. In other words, the frequency, as measured by an observer, shifts because the speed of the light relative to him shifts.

Pentcho Valev