The word clock derives from the medieval Latin word for 'bell'—clocca—and has cognates in many … See more

The apparent position of the Sun in the sky changes over the course of each day, reflecting the rotation of the Earth. Shadows cast by stationary objects move correspondingly, so their positions can be used to indi… See more

The invention of the mechanical clock in the 13th century initiated a change in timekeeping methods from continuous processes, such as the motion of the gnomon's shadow on a sundial or the flow of liquid in … See more

Clocks can be classified by the type of time display, as well as by the method of timekeeping.
Analog clocks usually use a clock face which indicates time using rotating pointers called "hands" on … See more

Clocks are in homes, offices and many other places; smaller ones (watches) are carried on the wrist or in a pocket; larger ones are in public places, e.g. a railway station or church. A small clock is often shown in a … See more