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clock: Quick Facts

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Earth Today | Clock ticks on 2030 nature targets • Oct. 22, 2026, 1:06 AM ET (The Gleaner)

Photos and Videos

reconstruction of the waterpowered mechanical clock
weight-driven clock works
Great Clock, Rouen, Fr.
Labeled diagram of a watch mainspring mechanism showing interconnected gears, the mainspring, balance wheel, winding pinion, escape wheel, and hands for hours, minutes, and seconds.
Diagram of an anchor escapement mechanism showing a pendulum attached to pallets that interact with an escape wheel, illustrating how this system regulates time in pendulum clocks.
clock
Diagram of a verge-and-foliot escapement mechanism in a mechanical clock, showing the escape wheel, vertical verge shaft with pallets, horizontal foliot bar, and regulating weights.
Diagram of a pendulum clock with labeled internal components, including the pendulum, driving weight, barrel, gears, anchor, pallet, escape wheel, and the clock face showing the hour, minute, and second hands.
Diagram of a quartz watch showing labeled internal components, including gears, battery, quartz oscillator, microprocessor, circuit board, coil, magnet, and motor, overlaid with a partial clock face.
Greenwich Mean Time
How do atomic clocks work?
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Related Topics and References

Topics

Key People

Bracket clock with oak case, ebony veneer, and gilt bronze mounts by Thomas Tompion, c. 1690; in the Victoria and Albert Museum, London.
Thomas Tompion
English clockmaker
banjo clock
Simon Willard
American clockmaker
default image
Edmund Beckett, 1st Baron Grimthorpe
English lawyer and horologist
default image
Edward John Dent
British clockmaker
Off-centre pillar-and-scroll wooden clock by Seth Thomas, c. 1818, under license from Eli Terry; in the American Clock and Watch Museum, Bristol, Connecticut.
Seth Thomas
American clockmaker
John Harrison
John Harrison
British horologist
Chauncey Jerome clock
Chauncey Jerome
American inventor
Off-centre pillar-and-scroll wooden clock by Seth Thomas, c. 1818, under license from Eli Terry; in the American Clock and Watch Museum, Bristol, Connecticut.
Eli Terry
American craftsman
default image
Ferdinand Berthoud
horologist and author
Quare, Daniel: Queen Ann clock
Daniel Quare
English clockmaker and inventor

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