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Aberration refers to the effect that requires slanting a telescope at an angle away from a target star so that the telescope’s motion (equivalent to the earth’s motion) is sufficient to allow light entering the objective lens to reach the eyepiece. This is said to confirm that the light cannot be carried along by the transmitting medium. Light entering the earth’s time gradient (TG) from an external source will have its forward speed adjusted to conform to the clock rate through which it is passing, but is not swept along in any direction by the TG. This is consistent with aberration. It should be noted that a TG could bend light entering it, an effect that is similar to, but not the same as, refraction. This accounts for the bending of light as it passes the sun. This may have some slight effect on the angle the telescope must be deflected. The effect would vary depending upon the angle the light from the star enters the earth’s TG. Telescopes at different locations on the earth might well observe slightly different aberration angles for the same star.
When externally emitted light passes through some system S’ to an outside observer in some other system S it would appear to pass directly through with perhaps some modification due to a speed change in S’. But to an observer in S’ the light would appear to be traveling in a different direction than the light’s direction relative to S.
Figure 1 is an animated illustration of aberration.
Figure 1
