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Sundials show time by projecting a shadow on a flat surface with lines to count as hours.
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A hourglass measures time with fine sand going through a small hole at a constant rate.
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Water clocks display time by any flow of water/liquid into a holder which it is measured.
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An astronomical clock shows time by display the sun, the moons age, phase, a star map and sometimes the planets.
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The Hairspring was invented to control the oscillating speed of the balance wheel.
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The atomic clock was based on past ideas of the clock.
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