A5 notes: Space-time diagrams
The relativity of simultaneity is a key concept in Einstein's theory of special relativity. It states that whether two events occur at the same time (i.e., are simultaneous) depends on the observer's frame of reference. In other words, two events that are simultaneous for one observer may not be simultaneous for another observer moving relative to the first. Why Does Simultaneity Become Relative? In classical...