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[[Image:Clock group.svg|thumb|right|Time-keeping on a clock gives an example of modular arithmetic.]] ...is a way of doing [[arithmetic]] with [[integers]]. Much like hours on a [[clock]], which repeat every twelve hours, once the numbers reach a certain value, ...

...]], clocks that are moving run slower according to a stationary observer's clock. ''This effect does not come from workings of the clocks, but from the natu ...\Delta t \,</math> is the time interval for an observer (e.g. ticks on his clock) – this is known as the ''[[proper time]]'', ...

...an be used for time keeping, and pendulums are used to regulate pendulum [[clock]]s. ...

[[File:Roman Clock.JPG|thumb|Roman clock ...for the 4 o'clock position aesthetically balances the ''VIII'' for the 8 o'clock position. Also, some use it as a metaphor that IIII was commonplace in an p ...

...ironment in ''discrete time steps''. Think of it like the "tick-tock" of a clock. With discrete time, things only happen during the "ticks" and the "tocks", ...

...''distance'' from the starting line goes up. Meanwhile, a [[stopwatch]] or clock measures the ''time'' as it goes up. We can measure the average [[speed]] o ...g to figure out a car's speed using only its odometer (distance meter) and clock, without a speedometer! ...

When a clock is in motion, it ticks slower by a tiny factor of <math>\gamma</math>. The ...

...t amount so that the speed of light remains the same. Imagining a "[[light clock]]" allows us to better understand this remarkable fact for the case of a si ...he time that it is observed ''t_(observed)'' (say today, at 12 o'clock) minus the time that it took for the observation to reach the observer. ...

'''rocking''': This motion is like a pendulum on a clock going back and forth only here an atom is the pendulum and there are two in ...

...g to figure out a car's speed using only its odometer (distance meter) and clock, without a speedometer! ...

...s direction of progress and weight. We could then know, at any time on the clock, both its position and its momentum (its velocity multiplied by its mass). ...