atomic clocks

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• atomic clocks — Clock Clock (kl[o^]k), n. [AS. clucge bell; akin to D. klok clock, bell, G. glocke, Dan. klokke, Sw. klocka, Icel. klukka bell, LL. clocca, cloca (whence F. cloche); al perh. of Celtic origin; cf. Ir. & Gael. clog bell, clock, W. cloch bell. Cf.… …   The Collaborative International Dictionary of English

• Atomic clock — Nuclear clock redirects here. For the clock as a measure for risk of catastrophic destruction, see Doomsday Clock. For a clock updated by radio signals (commonly but inaccurately called an atomic clock ), see Radio clock. For the album by Zion I …   Wikipedia

• atomic clock — an extremely accurate electronic clock regulated by the resonance frequency of atoms or molecules of certain substances, as cesium. [1935 40] * * * ▪ instrument       type of clock that uses certain resonance frequencies of atoms (usually cesium… …   Universalium

• atomic time — ▪ physics       timescale generated by atomic clocks (atomic clock), which furnish time more accurately than was possible with previous astronomical means (measurements of the rotation of the Earth and its revolution about the Sun). International …   Universalium

• atomic clock — noun a timepiece that derives its time scale from the vibration of atoms or molecules • Hypernyms: ↑timepiece, ↑timekeeper, ↑horologe • Hyponyms: ↑ammonia clock, ↑caesium clock * * * noun, pl ⋯ clocks [count] : a special kind of clock …   Useful english dictionary

• International Atomic Time — ( [http://www.bipm.org/en/scientific/tai/tai.html TAI] , from the French name Temps Atomique International) is a high precision atomic time standard that tracks proper time on Earth s geoid. It is the principal realisation of Terrestrial Time,… …   Wikipedia

• Primary Atomic Reference Clock in Space — The Primary Atomic Reference Clock in Space or PARCS is an atomic clock mission once scheduled to fly on the International Space Station (ISS) in 2008, but cancelled to make way for the Vision for Space Exploration.[1] The mission, to have been… …   Wikipedia

• international atomic time — a system of measuring time based on atomic clocks that measure the second as defined as the SI unit of time. Abbr.: IAT * * * International Atomic Time noun An international standard of time synchronized by atomic clocks (abbrev TAI) • • • Main… …   Useful english dictionary

• international atomic time — a system of measuring time based on atomic clocks that measure the second as defined as the SI unit of time. Abbr.: IAT * * * …   Universalium

• International Atomic Time — noun an international time standard, based on the SI unit of the second, synchronised by means of atomic clocks and satellites, introduced in 1958. Abbrev.: TAI …  

• List of clocks — This is a list of clocks that have attained a level of notability because of their historical importance, accuracy, exceptional artistry, or architectural value. North America *Colgate Clock New Jersey, United States *Clock of the Long Now, not… …   Wikipedia