Watches are just one of many possible instruments of time measurement time provides us with a measure of change by putting dates on moments fixing the durations of events and specifying which events happen before which other events in order to do that some method of time measurement is needed the science or art of the accurate measurement of time is known as chronometry or less formally timekeeping. Time is measured with instruments such as a clock or calendar these instruments can be anything that exhibits two basic components 1 a regular constant or repetitive action to mark off equal increments of time and 2 a means of keeping track of the increments of time and of displaying the result. A unit of time or midst unit is any particular time interval used as a standard way of measuring or expressing duration the base unit of time in the international system of units and by extension most of the western world is the second defined as about 9 billion oscillations of the caesium atom the exact modern definition from the national institute of standards and technology is the duration of 9192631770 periods of the radiation corresponding to the transition between . Physicists define time as the progression of events from the past to the present into the future basically if a system is unchanging it is timeless time can be considered to be the fourth dimension of reality used to describe events in three dimensional space it is not something we can see touch or taste but we can measure its passage
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