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Second Definition & Meaning

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This resulted in adoption of an ephemeris time scale expressed in units of the sidereal year at that epoch by the IAU in 1952. This extrapolated timescale brings the observed positions of the celestial bodies into accord with Newtonian dynamical theories of their motion. In 1955, the tropical year, considered more fundamental than the sidereal year, was chosen by the IAU as the unit of time. The tropical year in the definition was not measured but calculated from a formula describing a mean tropical year that decreased linearly over time.

There are references to 'second' as part of a lunar month in the writings of natural philosophers of the Middle Ages, which were mathematical subdivisions that could not be measured mechanically. ˌsecond-ˈhand adjective previously used by someone else. Coming after, and at a more advanced level than, primary. A person who supports and helps a person who is fighting in a boxing match etc.

The second thus defined is equivalent to the ephemeris second. A second is directly part of other units, such as frequency measured in hertz (inverse seconds or second−1), speed in meters per second, and acceleration in meters per second squared. The metric system unit becquerel, a measure of radioactive decay, is measured in inverse seconds. This definition refers to a caesium atom at rest at a temperature of 0 K.The revised definition would seem to imply that the ideal atomic clock would contain a single caesium atom at rest emitting a single frequency.

A consistent method of sending signals must be developed before the second is redefined, such as fiber-optics. The definition of a unit refers to an idealized situation that can be reached in the practical realization with some uncertainty only. In 1656, Dutch scientist Christiaan Huygens invented the first pendulum clock. It had a pendulum length of just under a meter which gave it a swing of one second, and an escapement that ticked every second. It was the first clock that could accurately keep time in seconds. By the 1730s, 80 years later, John Harrison's maritime chronometers could keep time accurate to within one second in 100 days.

The sixtieth part of a minute of angular measure, often represented by the sign 〃, as in 30〃, which is read as 30 seconds. The transmission gear or gear ratio used to produce forward speeds higher than those of first and lower than those of third in a motor vehicle. Often seconds An article of merchandise of inferior quality. Anything that decreases oil dependence is a good thing 370z.mywebcommunity.orgIn auto the car shifts seamlessly up to seventh gear by about 50 mph.