Einstein's 1905 constant-speed-of-light nonsense entails another nonsense: 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://www.einstein-online.info/wp-...ein-Online.gif

The absurdity is obvious. Variable (dependent on the speed of the emitter) wavelength of light violates the principle of relativity: by measuring the varying wavelength (or distance between light pulses), inside his spaceship, the emitter would know his speed without looking outside.

For a given emitter, the wavelength of light is CONSTANT.

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Pentcho Valev