| 21. | These early water clocks were calibrated with a sundial.
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| 22. | The Greeks considerably advanced the water clock by tackling the problem of the diminishing flow.
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| 23. | Midnight was not even considered because it could not be accurately determined using water clocks.
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| 24. | Some authors, however, claim that water clocks appeared in China as early as 4000 BCE.
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| 25. | I am trying to build a water clock.
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| 26. | Water clock and sun dials are mentioned in many ancient Hindu texts such as the Arthashastra.
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| 27. | A water clock, also known as a clepsydra, uses a flow of water to measure time.
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| 28. | They failed in developing an operational water clock.
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| 29. | Sundials and water clocks served to count hours.
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| 30. | It must have been a water clock because the ancients did not have mechanical clocks, right?
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