From Sundials to Atomic Clocks: Understanding Time and FrequencyU.S. Department of Commerce, Technology Administration, National Institute of Standards and Technology, 1999 - Clocks and watches - 308 pages |
Contents
The Riddle of Time | 3 |
Everything Swings | 15 |
How Time Tells Us Where in the World We | 24 |
22 other sections not shown
Common terms and phrases
accuracy accurate antenna astronomical atomic clocks balls beam better clocks big bang billiard broadcast calculations cesium atom Chapter cooling count crystal cycles depends device discussed distance Earth Einstein electric electronic emitted energy entropy example frequency standard frequency technology gravitational hertz hydrogen interval ionosphere ions JOHN ROBB JOHNNY HART keep kilohertz kilometers laser laws leap second length magnetic mathematical measure megahertz ment meters microseconds microwave million minutes molecules Moon motion moving nature navigation neutron star Newton's NIST observations optical orbit oscillator particles pendulum phase space photon possible precise predict problem pulse quantum mechanics quartz-crystal radar radiation radio signal receiver Relativity resonance curve resonant frequency rotation rubidium satellite scale scientists sine waves solar day speed of light star stations swings synchronized temperature theory time's direction timekeeping tion track trap units universe users voltage watch