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accuracy accurate ammonia molecule astronomical atomic clocks balance wheel balls beam better clocks BIPM broadcast century cesium atom Chapter cooling count crystal crystal oscillator cycles daylight-saving decay depends device direction discussed distance Doppler Earth electric electron emitted energy entropy example frequency standard frequency technology hertz high-Q resonator hydrogen interval ionosphere ions JOHNNY HART keep kilohertz kilometers laser laser cooling leap second length light magnetic mean solar measure megahertz ment meters microseconds microwave minutes Moon motion moving multiplexing natural frequency navigation NIST noise observations operation optical orbit oscillator particles path delay pendulum Penning Traps photon precise problem pulse quantum mechanics quartz-crystal radio signal receiver resonance curve resonant frequency rubidium satellite scale scientists slow solar day space speed stars stations swings synchronized syntonized temperature ticks timekeeping tion trap universe users vibrations water clock wave wheel