What are the differences between the concept of ancient and modern time measuring devices
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The sundial is looked on as being a form of sun-powered clock. ... This shadow clock or sundial permitted one to measure the passage of hours within a day. Another very early form of clock to tell the time was the water clock. The water clock was used by the ancient Greeks.An instrument used to measure time is called a clock. People used instruments such as sundials and hourglass to keep track of time. The movement of the shadow of a rod stuck upright in the ground, whose shadow changed direction with the movement of the sun across the sky, was used to make crude sundials.The oldest known sundial is from Egypt; it dates back to around 1500 BC (19th Dynasty), and was discovered in the Valley of the Kings in 2013. Sundials have their origin in shadow clocks, which were the first devices used for measuring the parts of a day.