In the moving car, we see that the path from the source of the left flash to the meeting point is three times longer than the right hand flash to meeting distance. No problem if this were a moving ball, we would conclude that they had different speeds, BUT we know the light flashes move always with v = c.
In the moving car, we see that the path from the source of the left flash to the meeting point is three times longer than the right hand flash to meeting distance. No problem if this were a moving ball, we would conclude that they had different speeds, BUT we know the light flashes move always with v = c.
The only possible conclusion is that they started at different times.
Einstein concluded that the time variable can vary in different observer frames. Simultaneity is relative. In primed system, t’ ? t in general. The assumption that while x depends on the system, t does not, is found to be an assumption, and a wrong assumption.