I thought even as far back as the 6th century people knew the world is round (Greeks/Romans), they even got the circumference pretty closely calculated. That wasn’t what was in question, it was what they would find that was in dispute. Columbus assumed he was taking a shortcut to get to India because he had some weird notions about the size of the earth (he thought it was smaller). The flat-earther stuff is more a modern conspiracy theory and Columbus’ story was embellished by Washington Irving (of Sleepy Hollow fame) to make it seem like everyone else thought the earth was flat.
At least 800 years before that, maybe more. Eratosthenes calculated Earth’s circumference around 240 BC. I would assume you have to believe the Earth is round is if you’re measuring a circumference.
I always wondered where the crazy idea that people once believed that the Earth was flat came from.
So, looks like it comes from a single prolific academic that mixed fiction and history, describing people just about a century before him, and that everybody took for gospel. A famous book said “hey, everybody on your grandpa generation believed this”, and it became common knowledge!
I’m not sure I’m even surprised by something like this.
Yes, Eratosthenes estimated the circumference of the Earth “with an error on the real value between −2.4% and +0.8%”, probably sometime between 250-200 BC (his adult life - I don’t think we know the exact date when he published his work).
I thought even as far back as the 6th century people knew the world is round (Greeks/Romans), they even got the circumference pretty closely calculated. That wasn’t what was in question, it was what they would find that was in dispute. Columbus assumed he was taking a shortcut to get to India because he had some weird notions about the size of the earth (he thought it was smaller). The flat-earther stuff is more a modern conspiracy theory and Columbus’ story was embellished by Washington Irving (of Sleepy Hollow fame) to make it seem like everyone else thought the earth was flat.
At least 800 years before that, maybe more. Eratosthenes calculated Earth’s circumference around 240 BC. I would assume you have to believe the Earth is round is if you’re measuring a circumference.
You’re right, many (most?) ancient civilizations knew the earth is round.
It’s not a big mental leap. Things disappear over the horizon. The sun and moon are round. Maybe the earth is round too 🤔
I always wondered where the crazy idea that people once believed that the Earth was flat came from.
So, looks like it comes from a single prolific academic that mixed fiction and history, describing people just about a century before him, and that everybody took for gospel. A famous book said “hey, everybody on your grandpa generation believed this”, and it became common knowledge!
I’m not sure I’m even surprised by something like this.
sounds like a meme that aged like milk
Yes, Eratosthenes estimated the circumference of the Earth “with an error on the real value between −2.4% and +0.8%”, probably sometime between 250-200 BC (his adult life - I don’t think we know the exact date when he published his work).