How Did Ancient Civilizations Measure Time Without Clocks?

Imagine a world where the sun is your clock and the moon helps you sleep. Without clocks, ancient people used things like the movement of the sun and the phases of the moon to know when it was time to work or rest. They also watched how shadows changed throughout the day on special stones called sundials. At night, they looked up at the stars, especially the North Star, to figure out where they were and what time it was.