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Master clock
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<p>A master clock is a precision <a href="/facts/Clock/MYolzNkw">clock</a> that provides timing signals to synchronise <a href="/facts/Slave_clock/tXvpCUtt">slave clocks</a> as part of a <a href="/facts/Clock_network/ycRn7vhP">clock network</a>. Networks of electric clocks connected by wires to a precision master pendulum clock began to be used in institutions like factories, offices, and schools around 1900. Modern <a href="/facts/Radio_clock/UdEegbB4">radio clocks</a> are synchronised by radio signals or Internet connections to a worldwide time system called <a href="/facts/Coordinated_Universal_Time/2EnjfSyu">Coordinated Universal Time</a> (UTC), which is governed by primary reference <a href="/facts/Atomic_clock/MF8nsXDR">atomic clocks</a> in many countries. </p><p>A modern, atomic version of a master clock is the large clock ensemble found at the <a href="/facts/U.S._Naval_Observatory/81pxwM2R">U.S. Naval Observatory</a>. </p>