An Earth-Based Coordinate Clock Network (Classic Reprint)

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Excerpt from An Earth-Based Coordinate Clock Network

The purpose of this paper is to investigate some of the possible operational procedures for synchronizing clocks at various fixed sites spread around on the earth's surface. There are a number of effects which could conceivably play a role in the synchronization of clocks-among these are the gravitational fields of the earth, moon, and sun, and the orbi tal motions, rotation, and flattening of the earth. Since most of the effects we shall discuss turn out to be fractional corrections to elapsed time , as a criterion of whether an effect is signifi cant at the level of l nanosecond , we shall take for comparison purposes an elapsed time Tc 10 hours, which corresponds to a typical time for an intercontinental airplane flight. This comparison flight will, where appropriate, be assumed to occur at.an altitude of he meters and at a speed of 450 meter/sec. The reason for selection of these parameters is that a fairly common synchronization procedure will be by transport of standard clocks in commercial jet airline flights [i].

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