Comment by CableNinja

How? You are here on earth, looking at a neutron star. It pulses about N times a minute. I am 5ly away, looking at the same neutron star. Yes, i see the pulses happening at about N times per second, but the pulse delay you see at time T(a) is not the same pulse delay i see at time T(a), it would be another 5 years before i see the same pulse you saw.