Einstein's 1905 constant-speed-of-light falsehood entails that the wavelength of light varies with the speed of the emitter, as is the case for sound waves or light waves in an ether:

https://youtube.com/watch?v=xsVxC_NR64M

This is an obvious absurdity. Variable (dependent on the speed of the emitter) wavelength of light violates the principle of relativity: by measuring the wavelength, inside his spaceship, the emitter would know his speed without looking outside.

If there is a next, Einstein-free version of fundamental physics, Einstein's 1905 false axiom

"The speed of light is constant"

will be replaced with the correct and easily justifiable axiom

"For a given emitter, the wavelength of light is constant".

I have developed the idea in a series of tweets he https://twitter.com/pentcho_valev

Pentcho Valev