Bradley's principle

Bradley's principle states that when an observer moves at a constant velocity, the law of physics remains the same in their moving frame as it does in a stationary one. In other words, the fundamental laws don’t change whether you're standing still or traveling at steady speed. This idea underpins Einstein’s theory of special relativity, emphasizing that motion is relative and no preferred frame of reference exists. It helps explain how measurements of space and time are affected by movement, ensuring that the laws of physics are consistent for all observers moving uniformly.