is also in complete agreement with the local time-order at any body
which is rigidly connected with
, i.e. which belongs to the same consentient set.
11.5 The reason why the velocity of light has been adopted as the standard velocity in the definition of simultaneity is because the negative results of the experiments to determine the earth's motion require that this velocity, which is the '
' of Maxwell's equations, should have this property. Also light signals are after all our only way of detecting distant events.
Certainly, once granting the idea of time-order being a local affair connected with a specific body