MinutePhysics brings us the top 10 reasons why we know the Earth is round.

It’s something that’s completely obvious now that we’ve, you know, been out in space and seen it for ourselves and all. But there’s some interesting observations that tell us that we live on a sphere*.

I think my favorite bit is the triangle with three 90˚ turns. Perhaps the most famous experiment to determine a round Earth was done in ancient Egypt by Eratosthenes, famously measuring the difference in high-noon shadows shadows of two distant towers.  Let Carl Sagan tell you all about it.

*Oh wait, we don’t actually live on a sphere. We live on an oblate spheroid. The Earth is not round**!!

**By “not round” I mean “not completely round like a basketball”

Source: youtube.com

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