Albert Einstein Institute: "We will start with a very simple set-up, which you can see in the following animation. On the right-hand side, drawn in red, there is a sender that emits pulses in regular succession. On the left-hand side there is a receiver, drawn in blue. The pulses themselves are drawn in red, and they all travel at the same speed from right to left. Everytime the sender emits a new pulse, a indicator light flashes once. Likewise, a flashing light indicates when a pulse has reached the receiver:

https://www.einstein-online.info/wp-...ein-Online.gif

Next, let us look at a slightly different situation, where the source is moving towards the detector. We assume that the motion of the sender does not influence the speed at which the pulses travel, and that the pulses are sent with the same frequency as before. Still, as we can see in the following animation, the motion influences the pulse pattern:

https://www.einstein-online.info/wp-...n-Online-2.gif

The distance between successive pulses is now smaller than when both sender and receiver were at rest." http://www.einstein-online.info/spotlights/doppler.html

So the Albert Einstein Institute assumes that "the motion of the sender does not influence the speed at which the pulses travel" (Einstein's 1905 constant-speed-of-light axiom), and concludes that "the distance between successive pulses is now smaller than when both sender and receiver were at rest"..

The conclusion is absurd, and therefore the assumption is false. Variable (dependent on the speed of the emitter) distance between successive pulses contradicts the principle of relativity. If the distance varied, by regularly measuring it 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, even nonsensical 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