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Spanning The Globe! Come join us for a measurement / revalidation of the Earths' circumference on June 19th, 2021.
Using only tools available to the ancient Greeks, we propose to calculate the circumference of the planet. We hope to get accuracy a little better than Eratosthenes did circa 200 BCE. We may have a slightly better gnomon but we promise not to use GPS.
Watch this space for more info.
Preparatory reading