ALL TIME KEEPING DEVICES depend on counting a regularly -repeated .phenomenon .The earliest devices were based on daily ,monthly, or yearly cycles of the sun and moon .Most modern clocks are based on repeated mechanical or electronic oscillations (vibrations). The more frequent the vibrations, the greater the potential accuracy of the clock.The crystal in the quartz watch typically vibrates at 32,768 hertz.(32,768 times a second), so it keeps better time than a pendulum clock ,whose pendulum typically swings twice a second .
The most accurate timekeeping devices are atomic fountains ,which are based on oscillations of caesium atoms .Global communication technologies , such as computer networks and broadcasting, rely on the world using one accurate time standard.This is called UCT.(UNIVERSAL COORDINATE TIME),and is based on the average time signal received from over 200 atomic clocks worldwide .The more we rely on high technologies for precise timekeeping ,the more vulnerable we become to problems with that technology.
THE ATOMIC FOUNTAIN.
At present ,the most accurate timekeeping device ,is the atomic fountain.It was developed by Nobel Prize-winning scientists in the early 1990s and is far more accurate than a standard atomic clock.The atomic fountain enable us to measure time with greater accuracy , mainly because it uses cooler ,slower-moving atoms than an atomic clock.Atomic fountain devices are accurate to within one ten-billionth of a second per day.
PENDULUM CLOCK.
In the 16th century , the Italian scientist Galileo Galilei used the regular swing of a pendulum to measure periods of time .He suggested that a pendulum could be connected to the hands of a clock to turn them in regular steps.
MEASURING TIME
The most accurate timekeeping devices are atomic fountains ,which are based on oscillations of caesium atoms .Global communication technologies , such as computer networks and broadcasting, rely on the world using one accurate time standard.This is called UCT.(UNIVERSAL COORDINATE TIME),and is based on the average time signal received from over 200 atomic clocks worldwide .The more we rely on high technologies for precise timekeeping ,the more vulnerable we become to problems with that technology.
At present ,the most accurate timekeeping device ,is the atomic fountain.It was developed by Nobel Prize-winning scientists in the early 1990s and is far more accurate than a standard atomic clock.The atomic fountain enable us to measure time with greater accuracy , mainly because it uses cooler ,slower-moving atoms than an atomic clock.Atomic fountain devices are accurate to within one ten-billionth of a second per day.
PENDULUM CLOCK.
In the 16th century , the Italian scientist Galileo Galilei used the regular swing of a pendulum to measure periods of time .He suggested that a pendulum could be connected to the hands of a clock to turn them in regular steps.
MEASURING TIME
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