How can you prove that the Earth is a sphere by looking at the horizon?
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ways to prove the earth is round
Watch a ship sail off to sea. ...
Watch a lunar eclipse. ...
Climb a tree. ...
Travel through, or even within, different time zones. ...
Watch a sunset. ...
Measure shadows across the country. ...
"International Space Station photos
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it's a case about Chan yin-lam of Hong Kong .
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