A clock is an instrument used to indicate and measure time .One of the first clocks used in ancient times was the sundial. Sundials were used in many cultures to help people understand what time it was. A sundial measured the time of day using the Sun. The Egyptians were the first to use sundials. They allowed citizens to divide the day into two parts by signifying noon. When the sun was directly overhead and the shadows of people and objects were at their shortest, it was said to be midday or noon. As the sun moved from east to west the shadows formed predicted the other times of day. Water clocks are another type of early clocks said to be invented by the Egyptians. These timepieces were different to sundials as they did not rely on the sun or any other celestial body. Water clocks measured time by a flowing of liquid into a container where the amount was measured. Markings on the inside surfaces measured the passage of hours as the water level reached them. find the word in the passage which means show
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- indicate
- measures
- used
- predicted
- marking
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