can you say me what are sundials, water clocks,and sand clock?

Sundials-A sundial is a device that determines the time of day by the position of the Sun. In common designs such as the horizontal sundial, the sun casts a shadow from its style onto a surface marked with lines indicating the hours of the day. The style is the time-telling edge of the gnomon, often a thin rod or a sharp, straight edge. As the sun moves across the sky, the shadow-edge aligns with different hour-lines.

Water clocks- A water clock is a timekeeping device which uses a flow of water to measure time. As you might imagine, a water clock is not as accurate as most modern time-keeping devices, but when waterclocks were first developed, they were quite adequate for the times. It is believed that waterclocks may be among the oldest of devices used to keep time, since written accounts of them date to around 4000 BCE, with physical examples from Egypt dating to 1500 BCE.

Sand clocks- sand timersand clock, measures the passage of a few minutes or an hour of time. It has two connected vertical glass bulbs allowing a regulated trickle of material from the top to the bottom. Once the top bulb is empty, it can be inverted to begin timing again. The name hourglass comes from historically common hour timing. Factors affecting the time measured include the amount of sand, the bulb size, the neck width, and the sand quality. Alternatives to sand are powdered eggshell and powdered marble (sources disagree on the best material). In modern times, hourglasses are ornamental, or used when an approximate measure suffices, as in board games.

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SUNDIAL:IT IS AN ANCIENT CLOCK USED BY THE CONCEPT OF SHADOWS AND SUN'S RAYS.

WATER CLOCKS ARE CLOCKS THAT RUN BY THE POWER OF WATER

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IN CONTINUATION TO MY PREVIOUS ANSWER:
Water clock is the clock used water as a source to measure time. It was used in ancient time as a substitute of sundial when sun is not there. The simplest of it consists two bowls one on the other. The upper bowl has a hole in the center through which water flows into the bowl at the bottom. The duration in which bowls emptied is taken as the time. There were variety of water clock like 1hour water clock, 2 hour, 5 hour and so on.
1 hour water clock means the water of the upper bowl emptied in 1 hour time.
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Here is the answer to yout very good question .Water clocks, along with sundials, are likely to be the oldest time-measuring instruments, with the only exceptions being the verticalgnomon and the day-counting tally stick. Where and when they were first invented is not known, and given their great antiquity it may never be. The bowl-shaped outflow is the simplest form of a water clock and is known to have existed in Babylon and in Egyptaround the 16th century BC. Other regions of the world, including India and China, also have early evidence of water clocks, but the earliest dates are less certain. Some authors, however, claim that water clocks appeared in China as early as 4000 BC.

The Greeks and Romans further advanced water clock design to include the inflow clepsydra with an early feedback system, gearing, and escapement mechanism, which were connected to fanciful automata and resulted in improved accuracy. Further advances were made in Byzantium and particularly the Islamic world, where increasingly accurate water clocks incorporated complex segmental and epicyclic gearing, water wheels, and programmability, advances which eventually made their way to Europe. Independently, the Chinese developed their own advanced water clocks, incorporating gears, escapement mechanisms, and water wheels, passing their ideas on to Korea and Japan

Some water clock designs were developed independently and some knowledge was transferred through the spread of trade. These early water clocks were calibrated with a sundial. While never reaching a level of accuracy comparable to today's standards of timekeeping, the water clock was the most accurate and commonly used timekeeping device for millennia, until it was replaced by more accurate pendulum clocks in 17th century Europe.And This is all that I know about i from my GK .

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