effect of rotation on light propagation

Rotation affects light propagation through a phenomenon called frame dragging, where a rotating mass (like a spinning planet or star) slightly drags spacetime around with it. This causes the paths of light beams to shift subtly, altering their trajectories compared to a non-rotating situation. In essence, rotation can influence the direction and speed at which light travels in the vicinity of massive, rotating objects, leading to effects such as gravitational lensing or time delays. These effects are important in astrophysics because they help us understand the behavior of light near rotating celestial bodies and test predictions of Einstein's theory of general relativity.