Either I am making very simple mistakes or it really seems like Earth is in the center of universe and everything else is moving around it.
Because, imagine a spaceship moving at 0.5C. When light emitted in the same and opposite direction regardless of speed of spaceshift light moves at the same speed relative to observer that observes this spaceship at 0.5C speed. Which means it is not possible for an observer inside this spaceship to observe lights emitted at opposite directions to be at same speed. Despite earth always moves light emitted at all directions moves exactly at same speed. Which means earth is the reference everything else moves relative to the earth.
I know theory tells fabric of universe bends (Aka time as another dimension) to make it possible and not that I really understand but to me it really seems like Einstein trolled the whole world by constructing obfuscated theories.