Didn't Eratosthenes show that the earth was round by measuring the diameter?
----- Original Message ----- From: "Dan-George Uza" <cerculdest...@gmail.com> To:"Sundial List" <sundial@uni-koeln.de> Cc: Sent:Mon, 17 Jun 2019 16:04:58 +0300 Subject:Can a sundial disprove Flat Earth? Hello, In my country there is this growing Flat Earth movement akin to religious fundamentalism. No matter what you throw at them, they simply ignore it. There is even a big group on Facebook of about 5,000 users. I recently joined there for fun. First I thought they were joking, but everybody seems dead serious about it. I nearly got kicked out because my profile photo shows a large armillary sundial which they consider to be a globe.... So preposterous! :) So I recently wondered: can a sundial can be used to prove the Earth is round? And what would be the simplest gnomonic proof for this? Dan Uza
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