I saw this the other night over the Atlantic, my F/O noticed it and I sagely explained it was just starlink satellites flaring.
He asked why the satellites were changing direction as they normally follow a set course.
I replied that it’s apparently an optical illusion. It didn’t seem convincing at the the time tbh and they definitely looked like they were changing direction.
I’ve been watching satellites pass through the sky for years over the Atlantic and these definitely look like they’re rotating in formation and changing direction.