Hi Bruce, It is possible of course to do the same analysis with a tilted clock but it wouldn’t be so easy because you should take into account the Lorentz contraction of the distance between the mirrors of the ligth-clock. Other issue would be the asymetric tick tock because one mirror would aproach and the other would escape from the light ball. It is much better for both visualization and calculation, to choose the mirrors paralel to the movement. Nevertheless with a tilted clock, no matter how much degrees, you would get the same time dilation.