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The answer to this question is tell the time of day
The shadow cast that used by ancient people will be really dependant on the positioning of the sun that creates a different type of shadows.
This serves a very similar purpose with modern-time clock because the people could predict the time of the day by simply seeing the type of the shadows

The shadow cast by a simple stick or obelisk allowed ancient people to keep track of time, establish different moments during the day, and with a little more precision, establish hours.

Further explanation

Time is a property of life that always goes on, it never stops. Since the beginning of time, humans have wanted to measure time and keep track of it. This idea was possible since we live in a periodic world, because we have a new day every 24 hours, and a ney year every 365 consecutive days.

In ancient times, we didn't have clocks that could tell us the time, so humans used the tools that they had at hand to do this. The most widespread tool that all could afford to use was the Sun, and they used it because the Sun rises everyday from the East and rests everyday at the west, more or less at the same time (at least in the Ecuador).

Therefor due to this periodic motion, ancient civilizations could keep track of at least some moments of the day, like when the Sun is at its highest point, or when the shadow done by an object is equal to the object's length. This was a rough but powerful idea, and then with the invention of other more precise tools (like sand clocks), they could keep track of specific lengths of time. Joining both principles together, the Sun clock was born.

In today's time, some of those Sun clocks are still seen (mostly as a way of decoration on parks), however they are a reminder of how things were done in the old days.

Learn more

  • Movement of the Sun: https://brainly.com/question/9352910
  • How time can be used for other porpuses: https://brainly.com/question/3154844

Keywords

Time, Sun, solar clock, sand clock

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