cesium clocks

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• cesium — /see zee euhm/, n. a rare, highly reactive, soft, metallic element of the alkali metal group, used chiefly in photoelectric cells. Symbol: Cs; at. wt.: 132.905; at. no.: 55; sp. gr.: 1.9 at 20°C; melts at 28.5°C. Also, caesium. [1930 35; < NL,… …   Universalium

• cesium 133 — noun Date: 1966 an isotope of cesium used especially in atomic clocks and one of whose atomic transitions is used as a scientific time standard …   New Collegiate Dictionary

• United States Naval Observatory — USNO redirects here. For other uses, see USNO (disambiguation). The Seal of the USNO with a quote from the Astronomicon, Adde guberandi studium: Pervenit in astra, et pontum caelo conjunxit, Increase the study of navigation: it arrives in the… …   Wikipedia

• OPERA neutrino anomaly — The OPERA neutrino anomaly is the detection of apparently faster than light neutrinos by the OPERA experiment in September 2011. The detection is anomalous because speeds exceeding that of light in a vacuum are generally thought to violate… …   Wikipedia

• GLONASS — ( ru. ГЛОНАСС ГЛОбальная НАвигационная Спутниковая Система; tr.: GLObal naya NAvigatsionnaya SputnikovayaSistema; en. Global Navigation Satellite System) is a radio based satellite navigation system, developed by the former Soviet Union and now… …   Wikipedia

• Roger Nichols (recording engineer) — Roger Nichols is a recording engineer best known for his work with the group Steely Dan.BiographyRoger S. Nichols (born September 22, 1944 in Oakland, California) was a nuclear operator at the San Onofre Nuclear Generating Station (SONGS) in the… …   Wikipedia

• Caesium — xenon ← caesium → barium Rb ↑ Cs ↓ Fr …   Wikipedia

• Second — This article is about the unit of time. For other uses, see Second (disambiguation). A light flashing approximately once per second. The second (SI unit symbol: s; informal abbreviation: sec) is a unit of measurement of time, and is the… …   Wikipedia

• History of timekeeping devices — For thousands of years, devices have been used to measure and keep track of time. The current sexagesimal system of time measurement dates to approximately 2000 BC, in Sumer. The Ancient Egyptians divided the day into two 12 hour periods, and… …   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 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