The measurement of time involves the use of various different units of measurement depending on the time scales and periods under consideration these range from the almost infinitesimal units employed in physics though the everyday units eg seconds minutes hours days months years etc to the much larger units used in geological and cosmological time scales. 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. Clocks as time tellers measuring time with the help of regularly repetitive events is easy when it comes to measuring months and years but for measuring it within a day a universal device is a must measuring time with the help of watch seems simple but the working of a watch is equally complex basically all watches work on a universal phenomenon of periodic motion. Time measurements time is calculated in a variety of ways for instance time can be calculated in seconds minutes hours days weeks and etc below are the different ways time is measured and the definition of each term
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