( SYNCHRONIZING OF TIME )
AT MULTIPLE LOCATIONS
" There is no difficulty in synchronizing two clocks in the same reference frame: one procedure is to send a light pulse simultaneously to two clocks from a point midway between them, with the two operators setting their clocks to a predetermined time when the pulses arrive. In a thought experiment it is often helpful to imagine a large number of synchronized clocks distributed conveniently in a single frame of reference. Only when a clock is moving relative to a given reference frame do ambiguities of synchronization arise."
University Physics Sears Zemansky Young 1980 page 254
In a thought experiment, place four cesium clocks at the four points of an equilateral
Let the length of each side be equal to the distance that light travels in one- hundredth
of a second (1860 miles) and be permanently physically attached to the center of
this tetrahedron and to each other.
Send 4 laser signals, from the tetrahedron center to all four locations at the same
As each location receives its signal, it records the moment and initializes the clock at its
Physically, each of these four points is of equal distance from the tetrahedron center, and
due to the four light signals travelling at the same speed, it allows these four points to
establish a common time frame.
These four points, along with their common time frame can be extended to include an
entire inter-coordinated system that could encompasses the entire universe.
The critical factor is that these four points never change location with respect to each