Atomic clocks use the frequency of an atomic oscillator to measure the passage of time, and are the most accurate clocks in existence. This atomic clock showcases the time, the date, the day of the week, and the temperature.
Cuckoo Clock Pendulum (Illustration)
This rendering of a cuckoo clock shows that is it just past four o'clock. The pendulum swings and the hour is chimed with a 'cuckoo' sound. This cuckoo clock also has a man and woman who come out on the balcony and dance around on the hour.
Silver Wall Clock (Photograph)
A silver wall clock with a white face and black hands is photographed on a bright green wall. The time reads 9:30. The clock is photographed slightly off center, so not all numbers are visible.
Sand Clock on a Conference Table
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