Age of Exploration
The Missing Day That Proved Earth Spins
A single battered ship returned in 1522 with its calendar off by exactly one day, and a Spanish mathematician realized those missing hours were empirical proof the world was round.
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Download on the App StoreAge of ExplorationRenaissanceSpainNavigationScientific DiscoveryCircumnavigationButterfly Effect16th Century
History is full of stories like this one.