It was an old fashion water clock.
As a method of telling time, the Sun could be considered the oldest clock in the world. Just by looking at its position relative to the ground, early humans could tell if it was morning, midday, evening, and nighttime. The sundial was developed as a more accurate way to tell this time, and eventually the water clock, mechanical clock and digital clock came along as steadily more accurate versions.
It is the sundial.
Jacobi
Clocks and timing are arbitrary and based on human concepts. There is no 'world clock', so it could never have stopped (or started).
Egypt
the world's first flight over a large body of water in a heavier-than-air craft.
The first alarm clock was powered by water where if the water was at a certain height, it would go off with a beeping sound.
The first robot in 270 BC was an organ and water clock made by Ctesibus who was a Greek Engineer. The water clock had figures that moved.
Chinese water clock
Egyptians and Babylonians
The first clock in the New World was made by Benjamin Banneker. He was an African American. His clock struck on the hour, made astronomical observations, and kept time for 40 years.
Peter Heinlein from Germany in 1510 invented the first wall clock in the world.
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The mechanical clock is a medieval invention. The ancient world measured time by sundial and the water clock. Both of these were used by the Babylonians in the second millennium BC and both were improved by the Greeks.
The first water clock is believed to have been created by the ancient Egyptians around 1500 BCE. This early timekeeping device used the flow of water to measure time intervals, with markings indicating the passage of hours.
The world's oldest clock tower is believed to be the Tower of the Winds in Athens, Greece. It was built in the 1st century BC and features a water clock to tell time.
The ancient civilization that is credited with inventing the clock is the Sumerians. They were thought to have created the clock's hour system with 24 hours and 60 minutes and the first clock prototypes known as sundials.
The water clock, also known as clepsydra, was first invented in China during the Eastern Han Dynasty around 200 BC. It was used to measure time by the flow of water from one container to another.