Since the dawn of civilization, man has looked to the heavens with awe searching for portentous signs. Some of these men became experts in deciphering the mystery of the stars and developed rules for governing life based upon their placement. The exact time to plant the crops was one of the events that was foretold by the early priest astronomers who in essence were the world’s first surveyors. Today, it is known that the alignment of such structures as the pyramids and Stonehenge was accomplished by celestial observations and that the structures themselves were used to measure the time of celestial events such as the vernal equinox.
KeywordsGlobal Position System Very Long Baseline Interferometry Global Position System Receiver Transit System Global Position System Satellite
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