Concise description using drawings and animation to show the operation of a pendulum clock.

Concise history, background, definitions and operational information regarding atomic clocks.

Using a patented KinderClock Chronichron, this site simultaneously displays both standard time's fixed hours and natural time's variable lengths of days and nights.

Kinds of cesium clocks, with pictures, plus a description of their operation and the science behind them.

History of the clock and how Americans have measured time and been affected by it.

Details on Doug Hogarth's experiments with his atomic clock.

This exhibit explores the inputs, outputs, and mechanisms of biological clocks with a primary focus on circadian rhythms.