  We show here that Common View Synchronization is valid to synchronize distant
clocks. We describe the relativistic physics, noting that a prerequisite for
synchronization is the existence of a space-time with a stationary metric. The
analysis shows that there are no Special Relativistic effects that need be
included in the synchronization method, beyond those in a standard GPS clock.
In particular, synchronizing a ground clock to the GPS satellite does not make
that clock keep time in the reference frame of the satellite. Symmetries are
very helpful in analyzing the behavior. We briefly describe some practical
considerations in synchronizing distant earth clocks, such as antenna cabling
and variations in receiver electronics, and how Common View Synchronization
accommodates them.
