Imagine in the distance you see a glowing spherical object hovering in the air.
Suppose light from point B on the surface of the sphere facing away from you can arrive at the camera simultaneously with light from A:
Since the object is moving at relativistic speeds, by the time light begins to...
Here is the space-time diagram of an observer:
Here is the diagram as seen by an observer travelling from left to right:
I have attempted to represent the axis system of the moving observer on the axis system of the stationary observer in the following diagram:
Event D seems to lie in...