Meet the crystals, atoms, leap years, railways, factories, and satellites that keep clocks and calendars in agreement.
A watch doesn't find one-second motions; it divides a much faster electrical rhythm
Atoms don't count the seconds; they correct an oscillator that is trying to match them
Leap rules are a long-term averaging system for a year that refuses to contain whole days
The railway did not make the Sun wrong; it made many correct town clocks impractical together
Your receiver turns several light-speed travel times into ranges; and solves its own clock error too
The clock became a tool for synchronizing labor, measuring wages, and controlling whose time counted