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Time is considered one of our most valuable assets. The keeping of time goes all the way back to the beginning of civilization. Both historians and archeologists believe that stationary and portable sun-dials were probably developed in Egypt or Mesopotamia. The oldest extant sun-dial can be found in Egypt and dates back to 1500 BCE. We know that the early Egyptians used the pyramids as well as the obelisks as a forerunner to the sundial. It is said that one of the first watches was created in Italy around 1524 CE. The main problem for portable time keeping before the 1600s was the lack of driving power. Timepieces of that era were typically driven by weights making it very difficult for portable use. The inaccuracy of timepieces in this era were very common and most watches only had one hand that had to be wound at least twice a day.
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