Clock

lastmod 2026-02-26created 2025-03-113 edits

A clock (時計) is a machine or device that shows or measures time. Clocks include those driven naturally or mechanically and those powered by batteries and the like; in everyday life, wall clocks, wristwatches, and desk clocks are widely used. Other kinds of clocks include striking clocks, hourglasses, water clocks, sundials, and alarm clocks. The most widely used clock today is the digital clock.

Technical explanations

• How a mechanical watch works
  • Explains the main parts inside a mechanical-movement watch one by one, with easy-to-follow animations
    • Spring, barrel, escapement, balance wheel, escape wheel, pallet fork, crown wheel, date disc.
    • Each part is shown in a different color, helping you understand how they work together
  • Each animation can be scrolled with the mouse to observe the motion step by step
  • Explains many other topics down to the details, with excellent animations and illustrations
    • Mechanical Watch, GPS, Curves and Surfaces, Naval Architecture (structure of ships), Internal Combustion Engine, Cameras and Lenses, Lights and Shadows, Gears, Tesseract, Earth and Sun, Alpha Compositing, Color Spaces, Exposing Floating Point, Mesh Transforms, Exposing NSDictionary, Exposing NSMutableArray, Drawing Bézier Curves, Exploring GPGPU on iOS

See also

• Royal Observatory, Greenwich
• Striking clock
• Alarm clock
• Hourglass
• Real-time clock
• Wristwatch
• Korean: 스마트 워치
• Pocket watch
• Clock tower
• Sundial
• Water clock
• Ilseong Jeongsi-ui
• Timer
• Stopwatch
• Prague astronomical clock
• UTC
• GMT

Favorite site

• Clock - Wikipedia