Let me stress, TERRESTRIAL EXPERIMENT, as distinct from astronomical observations of the transverse Doppler effect, stellar aberration and so on.
To clarify what I mean by 'thrown sideways'. Supposing a source of light is moved in a straight line at 300 metres per second in a direction orthogonal to the direction of propagation. Would the photons inherit the source's lateral movement so that they would take a path deviated by one part per million in the direction of the source's motion, from the direction they would have taken with the source stationary?
There are four possible answers to this question.
- Yes. The result was null. Light can not be thrown sideways.
- Yes. The result was positive. Light can be thrown sideways.
- Yes, but practical difficulties prevented any definitive results from being obtained.
- No. It is considered unnecessary to conduct such an experiment for the following reasons . . .
Which is it please?