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All chronometers and watches should be checked regularly with a radio time signal.
en.wikipedia.org Clocks, watches, clockwork, sundials, hourglasses, clepsydras, timers, time recorders, marine chronometers, and atomic clocks are all examples of instruments used to measure time.
en.wikipedia.org Two other methods of reducing sights are the longitude by chronometer and the ex-meridian method.
en.wikipedia.org By 1904 time signals were being sent to ships to allow navigators to check their chronometers.
en.wikipedia.org An observatory was built here for astronomical and meteorological observations and to provide accurate time for ships' chronometers in 1843.
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