for the establishment of timing relations because light has the fastest observed speed of propagation. This propagation speed is empirically observed to be invariant across inertial frames.

Synchronization of clocks is an operational task. In 1905, Einstein proposed a concrete set of steps for performing synchronization:
# At time , clock 1 sends a signal to clock 2 which is immediately reflected back. Its arrival time back at clock 1 is .
# The time which the signal reached clock 2, designated , is defined to be
::

Why synchronization is not a purely local operation

1.Previous
3.Next