Imagine you're on a ship sailing away from the shore. At first, you can see the whole island, but as you go farther, it starts to disappear from the bottom up, like it's being swallowed by the ocean. That happens because the Earth is round, and the water curves around it. Ancient people noticed this and started thinking the Earth might not be flat after all!
Why It Matters
When the sun or moon goes behind a hill, it’s like they’re hiding from view, but sometimes they come back later. That gave early thinkers clues about how big the world really was.
Examples
- A ship sailing away from a dock disappears bottom-first, like it's being eaten by the ocean.
- During an eclipse, parts of the Earth are in shadow at the same time, just like when you cover part of a light bulb with your hand.
- If the Earth were flat, the sun would always shine directly overhead, but we see shadows even at noon.
See also
- What Causes the Tides Exactly?
- Why Do We Have Different Seasons?
- What Causes a Volcano to Erupt?
- How Does a Battery Work?
- Why Do We Yawn When We're Tired?
Discussion
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Categories: Science · Earth· Geometry· History of Science · Text is available under the Creative Commons Attribution-ShareAlike License.