Movement (clockwork)
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In horology, a movement, also known as a caliber or calibre, is the mechanism of a watch or timepiece, as opposed to the case, which encloses and protects the movement, and the face, which displays the time. The term originated with mechanical timepieces, whose clockwork movements are made of many moving parts. The movement of a digital watch is more commonly known as a module.
Electromechanical self-winding clock movement from Switzerland
Movement of a Czech wristwatch
Movement of an old pocket watch
A modern bridge watch movement
Chronometry
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Chronometry or horology is the science studying the measurement of time and timekeeping. Chronometry enables the establishment of standard measurements of time, which have applications in a broad range of social and scientific areas. Horology usually refers specifically the study of mechanical timekeeping devices, while chronometry is broader in scope, also including biological behaviours with respect to time (biochronometry), as well as the dating of geological material (geochronometry).
The hourglass is often used as a symbol representing the passage of time
Clocks; a watch-maker seated at his workbench
Chronos, the Greeks' personification of time
Ancient Egyptian sundial splitting daytime into 12 parts