Read the two texts.
| Text 1 |
| Ancient Egyptians created one of the earliest known devices for measuring time: the sundial. Sundials were designed so that a shadow would be cast at different angles as the sun moved. The passing of time could be observed by watching the shadow’s position change. Since sundials relied on sunlight to create shadows, the device could not always be used to tell time. Sundials did not work at night or on cloudy days. |
| Text 2 |
| Ancient Egyptians developed a timekeeping device called a water clock. A water clock consisted of two stacked containers. The upper container was filled with water, which then dripped into the lower container. The steady rate of dripping was a dependable measure of time. People could tell how much time had passed just by measuring the water levels. For example, two and a half centimetres of water in the lower container might represent one hour. |