hi eeeg ...the physical meaning can be understood through time domain ....like phase theta=wt ...voltage phase lead in vi means voltage comes first by theta/w time then after current comes ...similar is the way .. commonly we represent phase in terms of angle
eeeg,
we can say 360 degree n 0 degree same because these two are in same phase ....after 1 cycle or 1 time period the overlapp each other therefore it is the same ....but if u look in time domain 0 degree comes first n then 360 degree comes second ...but after 1 cycle both arrives at the same rate ...so we refer them as the same