Imagine you're on a boat sailing away from the shore, eventually, you can no longer see the land, just the top of a ship. That’s because Earth is round! Like a ball, Earth curves around, so we can’t see everything at once.
Long ago, people noticed that when ships sailed into the distance, they disappeared bottom-first, like going over a hill. This helped early scientists guess that Earth wasn’t flat, it was more like a giant sphere.
Examples
- A ship sailing away disappears bottom-first over the horizon, like going over a hill.
- During a lunar eclipse, Earth’s shadow on the moon looks curved, just like a sphere.
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See also
- What Causes a ‘Day’ and How Is It Measured Exactly?
- How Does a Shadow Form on the Moon?
- What Causes a Solar Eclipse and Why Does It Happen Only Sometimes?
- What Causes the ‘Change of Seasons’ and Why Does It Happen Every Year?
- What Causes a Solar Eclipse to Happen?
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