Scientific consensus on Earth's spherical shape, reinforced by centuries of empirical data from navigation, astronomy, and satellite imagery, drives the overwhelming 99.3% implied probability against a flat Earth outcome on Polymarket. Trader sentiment reflects this established reality rather than any recent cultural shift or viral moment, with no meaningful developments in the past 30 days to alter the market. While entertainment narratives occasionally amplify conspiracy themes for engagement, they lack the verifiable backing that shapes capital-backed consensus here. Realistic upset scenarios remain negligible, limited perhaps to an unforeseen resolution criteria change or extreme reinterpretation of the question, though historical precedent and physical evidence make such reversals highly improbable.