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United States Naval Observatory
(Encyclopedia)United States Naval Observatory, a federal astronomical observatory, located in Washington, D. C. It evolved from the Navy's oldest scientific institution, the Depot of Charts and Instruments, founded...Turner, Ted
(Encyclopedia)Turner, Ted (Robert Edward Turner 3d), 1938–, American television network executive, b. Cincinnati. After inheriting his father's billboard company, he founded (1976) a television station, WTBS, and...transit instrument
(Encyclopedia)transit instrument or transit, telescope devised to observe stars as they cross the meridian and used for determining time. Its viewing tube swings on a rigid horizontal axis restricting its movements...sea level
(Encyclopedia)sea level, the level of the sea, which serves as the datum used for measurement of land elevations and ocean depths. Theoretically, one would expect sea level to be a fixed and permanent horizontal su...atomic clock
(Encyclopedia)atomic clock, electric or electronic timekeeping device that is controlled by atomic or molecular oscillations. A timekeeping device must contain or be connected to some apparatus that oscillates at a...pendulum
(Encyclopedia)pendulum, a mass, called a bob, suspended from a fixed point so that it can swing in an arc determined by its momentum and the force of gravity. The length of a pendulum is the distance from the point...clock
(Encyclopedia) CE5 A pendulum clock: Weight-driven clock mechanism clock, instrument for measuring and indicating time. Predecessors of the clock were the sundial, the hourglass, and the clepsydra. See also watc...Robinson, Sugar Ray
(Encyclopedia)Robinson, Sugar Ray, 1920–89, American boxer, b. Detroit as Walker Smith, Jr. He began boxing after three years of high school in New York City. Having won all his amateur fights (about 90), includi...Poopó
(Encyclopedia)Poopó pōˌōpōˈ [key], salt lake, on the high plateau of W Bolivia. It is more than 11,000 ft (3,353 m) above sea level. Although it is Bolivia's second largest lake (965 sq mi/2,499 sq km) when w...Ratas, Jüri
(Encyclopedia)Ratas, Jüri, 1978–, Estonian political leader. A member of the Center party, a populist party with strong support among ethnic Russians, Ratas was mayor of Talinn (2005–7), before entering the Es...Browse by Subject
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