see relativity of simultaneity clock
In Fig. 4-5b, the same rod is observed from the frame of a rocket moving at speed 



v


{\displaystyle v}

 to the right. If we imagine two clocks situated at the left and right ends of the rod that are synchronized in the frame of the rod, relativity of simultaneity causes the observer in the rocket frame to observe (not see) the clock at the right end of the rod as being advanced in time by 



L
v

/


c

2


,


{\displaystyle Lv/c^{2},}

 and the rod is correspondingly observed as tilted.
