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The basic unit of time in the International System of Units , equal to the duration of 9,192,631,770 cycles of radiation in a transition, or energy level change, of the cesium atom. Sundials and water clocks were among the earliest timekeeping devices, and units of time were measured in degrees of arc. Conceptual units of time smaller than realisable on sundials were also used. A mechanical clock, one which does not depend on measuring the relative rotational position of the Earth, keeps uniform time called mean time, within whatever accuracy is intrinsic to it. That means that every second, minute and every other division of time counted by the clock will be the same duration as any other identical division of time.

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.

Pertaining to the gear transmission ratio at which drive shaft speed is greater than that of low gear but not so great as that of other gears for a given engine crankshaft speed.

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.

“Preferred” listings, or those with featured website buttons, indicate YP advertisers who directly provide information about their businesses to help consumers make more informed buying decisions. YP advertisers receive higher placement in the default ordering of search results and may appear in sponsored listings on the top, side, or bottom of the search results page. The second is also a common base unit for expressing extremely long spans of time, such as geologic time units, like the millennium, mega-annum, or giga-annum.

Starting in the 1950s, atomic clocks became better timekeepers than Earth's rotation, and they continue to set the standard today. In science, a second is the time it takes for a caesium atom to vibrate 9,192,631,770 times. Scientists measure the second this way because the length of a day changes all the time. For example, when the dinosaurs lived, a day was about an hour shorter. Vibrations of atoms on the other hand always take the same time. The Earth's motion was described in Newcomb's Tables of the Sun , which provided a formula for estimating the motion of the Sun relative to the epoch 1900 based on astronomical observations made between 1750 and 1892.