Einstein’s special relativity is based on the postulation that light speed is constant no matter the light sources and observers. In addition, he proposed Velocity Time Dilation based on the same concept constant light speed. In fact, according to Yangton and Yington Theory, light speed C' is the vector summation of Absolute Light Speed C (3x108 m/s on earth) and Inertia Light Speed V (speed of light source).
C' = C + V
As to Velocity Time Dilation, it is nothing but a pure mathematical definition which is used to compensate constant light speed in actual distance measurement.
D = C' t = C t'
In case C is perpendicular to V,
(C't)2 = (Vt)2 + Ct2
Therefore,
t’ = 1/(1-V2/C’2)1/2 t
Because
V’ = Vt/t’ (Einstein’s definition)
C = C’t/t’ (Einstein’s definition)
Then
t’ = 1/(1-V’2/C2)1/2 t
Where t’ is Einstein’s imaginary time and V’ is Einstein’s imaginary speed of light source observed at the reference point.
This equation is identical to Einstein’s Velocity Time Dilation.
As a result, Einstein’s Velocity Time Dilation is nothing but an imagination or a pure mathematical definition. Its only purpose is to support Einstein’s wrong postulation “Light speed is constant no matter the light sources and observers”.