Hubble Space Telescope images of Jupiter have been "photo-mapped onto a sphere," and animated into a full rotation, according to ESA/NASA. Credit: Space.com | NASA, ESA, J. DePasquale (STScI), A.

Shown below is an animation of the motion of A and B as seen by a stationary observer. The paths of A and B are straight and circular, as expected. View of B as seen by an observer on A ...