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Counting intervals has been going on since man’s beginning. Early time measurements involved counting the number of days in terms of sunrises, sunsets, or moons. Later, the day was divided into smaller increments by using an hourglass, candles, sundial, etc. With the discovery of the pendulum, clocks were born. The accuracy of early clocks was around 1 part in 1000.
As more accurate clocks were produced, new uses of time measurement were explored. As new uses were discovered, the need for even more accurate clocks became apparent.
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