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Table of ContentsIntroduction to the Science of Timekeeping .......................................... 8 Precise Timing Applications Pervade Our Society ................................ 10 Clocks and Timekeeping............................................................................ 14 The Definition of the Second and its General Importance .................. 19 Historical Perspective ................................................................................ 19 An Illustrative Timekeeping Example ..................................................... 22 UTC, Official Time for the World ............................................................. 26 GPS Time and UTC ..................................................................................... 30 Accuracy and Stability of UTC .................................................................. 31 Einstein’s Relativity and Precise Timekeeping ...................................... 36 How to Access UTC .................................................................................... 39 Future Timing Techniques......................................................................... 44 Global Navigation Satellite System Developments ................................ 47 UTC and the Future .................................................................................... 52 Conclusions ................................................................................................. 53 Acknowledgments ...................................................................................... 54 Appendix A: Time and Frequency Measures Accuracy, Error, Appendix B: Stability Analysis of Harrison-like Chronometers ........... 66 Appendix C: Time and Frequency Transfer, Distribution Glossary and Definitions............................................................................ 82 Bibliography ................................................................................................ 85 |
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