We know that the trajectory of light is bent when it leaves a vaccuum or optical medium of one optical density enters a curved optical medium with a different density. This is attributed a change in the constant speed of light in the new medium and it is claimed that while the medium would have to be exerting and an effect on the light for this to occur the individual photons expereience no net loss of energy. This is not notwithstanding those that are adsorbed and remitted. Similarly the gravitational field around a massive object in a vaccuum bends light without affecting its speed. I wonder how movement to each of these types of objects while they are influencing a ray of light alters the expected trajectory from when they are at rest. Both ultra fast ossilations and rotations would best be done in the weightless vaccuum of space.