Time - From Earth Rotation to Atomic Physics

Filling the need for a book that conveys the current technology as well as the underlying history and physical background, the authors draw on their longstanding research experience to tell physicists and engineers how to measure time to the precision required for modern-day use.

Autorentext
Dennis D. McCarthy worked in the Time Service and Earth Orientation Departments of the U. S. Naval Observatory (USNO) for the past 40 years, reaching the position of Director of Time at USNO. He has been involved in both the developments of time keeping and time transfer, and the developments of accurate Earth Orientation observation and prediction. He is the author of a large number of papers on time scales and Earth Orientation. P. Kenneth Seidelmann worked in the Nautical Almanac and Orbital Mechanics Departments of the U. S. Naval Observatory for 35 years, reaching the level of Director of Astrometry at USNO. He has been involved in the ephemerides developments, relativistic developments of dynamical time scales, and the applications of improved accuracies of time scales and astrometry. He is currently a Research Professor at the University of Virginia. He is editor of the 'Explanatory Supplement to the Astronomical Almanac', coauthor of 'Fundamentals of Astrometry', and author of a large number of papers on astronomy.

Inhalt
Preface 1. Time-Pre 20th Century 2. Solar Time 3. Ephemerides 4. Variable Earth Rotation 5. Earth Rotation and Polar Motion 6. Ephemeris Time 7. Dynamical Time Scales 8. Clock Developments 9. Atomic Clocks 10. International Atomic Time (TAI) 11. Definition and Role of a Second 12. Coordinated Universal Time 13. Relativity and Time 14. Time in the Solar System 15. Time Transfer 16. Modern Earth Orientation 17. International Activities (BIH, IERS, BIPM) 18. Precise Time Requirements 19. Future Timekeeping 20.References 21. Acronyms Index

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