Don't think I've seen this elsewhere here
Cool to see the oscillations from the solar array's drive motors (mostly the axis rotating around the sat), and also how the mass participation is large enough that the whole satellite is reacting in kind. (If you focus on where the earth horizon meets the edge of the video frame you can see that the whole satellite is oscillating in reaction to the wing moving.)
The user beams are so narrow and have such a sharp rolloff that its likely this kind of pointing oscillation has to be accounted for in the beamformer to make sure users at the edge of a beam don't bounce in and out of their link closing--In other words, the beam directions are likely oscillating 'opposite' to the satellite/atenna oscillation, so the beam footprint on the ground stays stable.
Edit: Oh yeah, I guess also the eclipse is cool too.