A sundial is like a clock that uses the sun to tell time.
Imagine you have a friend who stands in the sunlight all day and moves around as the sun moves across the sky, that’s kind of how a sundial works! It has a stick or a triangle called a gnomon, which casts a shadow on a special plate with numbers or lines. As the sun moves, the shadow moves too, showing you what time it is.
How the Sun Helps
The sun is like a big, bright friend who’s always moving. In the morning, it’s low in the sky, and by noon, it's high up. A sundial uses this movement, just like how your shadow gets longer when you walk away from a light.
The Shadow Tells Time
The shadow on the sundial is like an arrow pointing to the time. If it’s pointing to 10, that means it’s 10 o’clock! Some sundials even have special marks for sunrise and sunset, just like how your clock has numbers from 1 to 12.
Sundials are fun because they use the sun and shadows, things you can see every day, to tell time in a very old, clever way.
Examples
- A child sees a shadow on the ground and notices it moves as the day goes by.
- An old man explains how his grandfather used a stick to tell time in the garden.
- A teacher draws a simple picture of the sun moving across the sky.
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See also
- What are sun dials?
- What are lunar calendars?
- How Did the Ancient Romans Heat Their Homes?
- How Did the Ancient Romans Use Concrete?
- What is Water clocks (clepsydra)?