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Man has always struggled to keep accurate track of the time. The origins of the hourglass are not exactly certain. They might have been used as early as the 11th century CE, although we do not have assured evidence of their existence until the 14th century. Another early developed timekeeping device was the water clock. Its exact origins are unknown, but water clocks have been found dating as far back as 1500 BCE in ancient Egypt. The device works by allowing water to pass through a small aperture of the clock at a certain rate. By watching this flow of water you will be able to tell what time it is, even at night as it was not based upon the Sun. Water does not always flow at a consistent rate, however, so this device was not perfectly accurate. The water clock was well used in Mesopotamia.

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12y ago

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