A light clock shown in the following figure consists of four mirrors A, B, C, and D. Distances AB=BC=CD=DA. Angle ABC = Angle BCD= Angle CDA = Angle DAB =90

^{o} or θ1 = θ 2 = 45

^{o} degrees. The observer in the clock at point A is O

_{c}. There is another stationary observer O

_{s} on an asteroid. A pulse of a light clock takes 1 second to complete a path of ABCDA or ADCBA for all stationary observers. The clock of O

_{s} is synchronized with the light clock before its journey into space. Let the said clock starts moving at a very high speed in space relative to O

_{s}.

It is observed that a pulse misses its upper target if the aforementioned light clock moves at any speed. It means a pulse of light doesn’t even hit mirror B if fired at A in its desired direction towards mirror B due to the speed of the light clock in its forward direction.

Even if the firing angle of a pulse is adjusted with the speed of a moving clock, then it (a pulse) still misses the lower target/ mirror “C” in its round trip if the speed of the light clock is less than the fifty percent speed of light.

A light clock can be designed in an infinite number of ways. So, is the light clock used by Einstein, which consists of two mirrors for the derivation of his famous equation of “Time Dilation” standard?