वॉटर बेस्ड हाउ डिड ए अफेक्ट द क्लॉक
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A water clock or clepsydra is any timepiece by which time is measured by the regulated flow of liquid into or out from a vessel, and where the amount is then measured.
Water clocks are one of the oldest time-measuring instruments. The bowl-shaped outflow is the simplest form of a water clock and is known to have existed in Babylon, Egypt, and Persia around the 16th century BC. Other regions of the world, including India and China, also have early evidence of water clocks, but the earliest dates are less certain. Some authors, however, claim that water clocks appeared in China as early as 4000 BC.
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