Can anyone guarantee two atomic clocks are perfectly synchronized when measuring light & radio sygnal delays?

Question

In relativistic physics, radio signals and light bend due to interactions with plasma (for example, when they cross the vicinity of the Sun). But how can anyone guarantee that two atomic clocks, placed in distant locations, used for measuring time delays caused by geometrical differences between the extremities of bent trayectories, are synchronized with each other accurately enough?

Answer 1

They're not bent dues to interaction with plasma, they are bent due to the gravitational effect of SO MUCH plasma.

The only way to assure it is to know exactly how long it takes a signal to get to the other clock and back, then when you query it as to it's exact time, you can subtract that time from any difference that shows up.

Answer 2

Myself and another Eng. is the fathers of time synchronization via sat elite. Over a 44,000 mile path to a synchronized satellite the N.A.S.A. tine lab gave us a short time sync of 100 nano seconds. The clocks were accurate to 1.6 times to thee 14th.
The time people never speak of exact time . There is a short time and long time ,the long time is done through many short time periods. there are grafted and a correction calculated. this could be in the area of 1 nano second. This was more than accurate enough for very long baseline noise interferometer. The time systems would sync and then we look at a star and do a digital noise interferometry. The results were very good.

Answer 3

Yes, it is possible to perfectly synchronize two atomic clocks at a distance, assuming you have knowledge of the path (or time of flight) that light will take from any given point between the two clocks.

Answer 4

The clocks have been tested, it is known exactly how innacurate they are.

How to test an accurate clock?, its no good comparing it to a pocket watch!.
A clock can be tested by using it to measure the speed of light, keep a log of all the results and there you have the accuracy of the clock

Answer 5

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